Service Manual
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Low Flow MicroBlender Service Manual
L1130 Rev. C
This document is protected by United States and International Copyright laws. This document may not be copied, reproduced, translated, stored in a retrieval system, transmitted in any form, or reduced to any electronic medium or machine-readable form, in whole or in part, without the written permission of CareFusion. Information in this document is subject to change without notice. This document is for informational purposes only and should not be considered as replacing or supplementing the terms and conditions of the License Agreement. © 1991 - 2013 CareFusion Corporation or one of its subsidiaries. All rights reserved. CareFusion and the CareFusion logo are trademarks of CareFusion Corporation or one of its subsidiaries. All other trademarks are the property of their respective owners. CareFusion 22745 Savi Ranch Parkway Yorba Linda, CA 92887 U.S.A.
CareFusion Germany 234 GmbH Leibnizstrasse 7 97204 Hoechberg Germany
800.231.2466 toll-free 714.283.2228 tel 714.283.8493 fax
+49 931 4972-0 tel +49 931 4972-423 fax
Document part number: L1130 Revision C
ii
L1130 Rev. C
How to get help: If you need assistance while servicing or operating the ventilator, or you require additional information, contact CareFusion. Technical support: Hours: 6:00 a.m. to 5:00 p.m. PST, Monday through Friday 714.283.2228 (follow the prompts to technical support) 714.283.8471 fax [email protected] CareFusion helpline: Hours: 24 hours, 7 days per week 800.231.2466 or 800.328.4139
L1130 Rev. C
iii
Table of Contents
Section 1:
Overview of the 3920 Low Flow MicroBlender Operation. . 1
Section 2:
Warnings, Cautions and Notes... 4
Section 3:
Troubleshooting... 6
Section 4:
Service, Repair and Calibration... 7
Section 5:
Performance Check... 28
Section 6:
Cleaning and Sterilization... 29
Section 7:
Maintenance and Service Policy... 30
Section 8:
Replacement Parts... 31
Section 9:
Product Specifications... 34
Section 10: Warranty... 36 Appendix - MicroBlender Bypass/Alarm Sleeve... 37 Note: This manual is intended as a guide for the service/repair calibration of the Low Flow MicroBlender by a qualified technician.
iv
L1130 Rev. C
Section 1: Overview of the 3920 Low Flow Microblender Operation Balance Module (Figure 3)
The Low Flow MicroBlender mixes medical grade compressed air and oxygen to provide a pressurized gas source ranging from 21% to 100% oxygen.
The two gases then enter the two-stage Balance Module. The purpose of this module is to equalize the operating pressure of the air and oxygen gas sources before entering the Proportioning Module. The diaphragm responds to the difference in pressure and directs the movement (stroke) of each ball valve assembly contained within the air and oxygen chambers. The movement of each ball valve adjusts the amount of gas flowing through the Balance Module, equalizing the air and oxygen pressures.
Figure 1 The two 50±5 PSIG (3.52 ± 0.35 kg/cm2) gas sources enter through the diameter indexed (DISS) air and oxygen inlet connectors located on the bottom, rear of the blender (Figure 2). Each inlet connector incorporates a 30 micron particulate filter. From the filter the gases travel through a duckbill check valve which prevents possible reverse gas flow from either the air or oxygen supply systems.
Figure 3 Air-Oxygen Blender Diagram
Proportioning Module (Figure 4) From the Balance Module the gases flow into the Proportioning Module and are mixed according to the oxygen percentage selected on the external control knob. This Module consists of a double ended valve positioned between two valve seats.
Figure 2 L1130 Rev. C
1
Overview of the 3920 Low Flow MicroBlender Operation One valve seat controls the passage of air and the other valve seat controls the passage of oxygen into the Low Flow MicroBlender outlet. At this point, the two gases have been blended according to the oxygen percentage selected on the MicroBlender control knob.
both gas pressures (oxygen or medical air) increase or decrease simultaneously, and a 20 PSI (1.41 kg/cm 2) differential is not seen, there will not be an audible alarm. If either source gas pressure drops, the output pressure of the blender will drop similarly, since the source gases are always balanced to that of the lower pressure. The bypass function operates in unison with the alarm. The alarm bypass poppet communicates directly with the air supply on one end and the oxygen supply on the other.
Figure 4 With the control knob at the full counterclockwise position (21%), the double ended valve will completely close off the flow of oxygen, allowing only the air to flow. By adjusting the control knob in the full clockwise (100%) position the flow of air is blocked, permitting only the flow of oxygen through the blender outlet.
Figure 5 When the two source gases are near equal in pressure, the alarm bypass poppet is positioned over the bypass channel, blocking the flow of both gases. The poppet will remain seated for unequal pressures up to 20 PSI (1.41kg/cm 2). Once a 20 PSI (1.41kg/ cm 2) difference is sensed by the poppet, the higher gas pressure will overcome the spring force and pressure as its opposite end, thus creating a path for gas (air or oxygen) to flow into the alarm channel.
Alarm/Bypass (Figure 5) The alarm feature provides for an audible alarm if source pressures differ by 20 PSI (1.41 kg/cm 2) or more. The primary purpose of the alarm is to audibly warn the operator of an excessive pressure drop or depletion of either source gas. The alarm will also activate in the event of elevation of either source gas when a difference of 20 PSI (1.41 kg/cm 2) or more is detected. Should 2
L1130 Rev. C
Overview of the 3920 Low Flow MicroBlender Operation The gas with the higher pressure will also flow directly to the blender outlet port bypassing the Balance and Proportioning Modules. The gas is also directed to the bottom of the unit to the reed alarm, thus creating an audible warning. The oxygen concentration will be that of the gas at the higher pressure. The blender in the alarm/ bypass mode will deliver the oxygen (100%) or air (21%) until the bypass mechanism resets when source gas pressure is restored to a differential of approximately 6 PSI (0.42 kg/cm2).
allowing the mixed gases to flow through the primary outlet.
Some characteristics of the alarm/bypass system on the Low Flow MicroBlender differ somewhat from those of model 3300 and other older model blenders. If the Low Flow MicroBlender is set at 21% and the oxygen source pressure is reduced sufficiently to produce a 20 PSI (1.41kg/ cm 2) or greater differential, the unit will not alarm because it will continue to deliver 21% concentration according to the setting. If the control is moved slightly from the 21% setting, the alarm will sound.
Figure 6 The auxiliary outlet is located on the right side of the Low Flow MicroBlender and is designed to deliver metered gas through a flowmeter. Mixed gas may be delivered within specified accuracy tolerance from this outlet at 0.5 LPM and above. When a connection is made to the auxiliary outlet a 2.5-3.5 LPM bleed of mixed gas to the atmosphere is activated. This bleed is essential to ensure accuracy of concentration for applications utilizing low flows down to 3 LPM.
Similarly, if the Low Flow MicroBlender is set to deliver 100% concentration and air source pressure is reduced or lost, the unit will not alarm because it will continue to deliver the selected 100% concentration. The Low Flow MicroBlender is left connected to source gases but is not being used (i.e. no output flow or bleed flow), the unit will not alarm if a 20 PSI (1.41kg/cm 2) or greater pressure differential develops. It is felt that if the blender is not in use, an alarm under these conditions may be an unnecessary distraction or nuisance.
Primary outlet port
Auxiliary outlet port
Gas Outlets (Figure 6) The primary gas outlet is used for unmetered high flow applications in the range of 3-30 LPM. The flow of gas is automatically initiated by an attachment of a pneumatic device to the outlet port. A check valve is unseated upon connection L1130 Rev. C
Figure 7 3
Section 2: Warnings, Cautions and Notes The Low Flow MicroBlender should be operated by trained, qualified medical personnel under the direct supervision of a licensed physician. Before clinical application, the WARNINGS, CAUTIONS and NOTES should be read and understood.
CAUTION: Conditions may exist
that could damage the Low Flow MicroBlender or other pieces of equipment.
WARNING: Conditions may exist
NOTE: A specific point is made to assist the operator in its understanding.
that could adversely affect the operator or patient.
WARNINGS:
• The Low Flow MicroBlender should be serviced and/or calibrated by a CareFusion trained hospital/dealer service technician or CareFusion.
• Respirable (medical) air should meet the requirements of an ANSI Z86.11973 commodity specification for air, Type 1 Grade D or better. It should also have a dew point of 5°F (2.75°C) or more below the lowest temperatures to which the air distribution (piping) system is exposed. Particulate (condensed) water in the air supply is harmful to many medical devices utilizing or controlling compressed air. Filters frequently become restricted by deposits of dissolved salts and other airborne matter. While compressed air is typically the major source of deposits, other medical gases and distribution systems are capable of delivering filter restricting matter. This restriction of filters causes insidious reduction in flow capability of the blender, possibly starving a downstream device such as a ventilator, causing malfunction. Therefore, it is very important to perform preventative maintenance, minimally at recommended intervals on devices with filters, especially if the gas supply is not known to be clean and/or free of condensed water.
• The Low Flow MicroBlender is designed to operate from a 50 PSIG (3.52 kg/ cm2) air source and a 50 PSIG (3.52 kg/cm2) oxygen source. • Do not occlude or obstruct the bleed port or muffler on the bottom of the MicroBlender. • Adjustment of oxygen concentrations should be verified by an oxygen analyzer. • When the Low Flow MicroBlender is not in use and the auxiliary outlet is connected, close off gas supply sources as the continuous gas bleed may drain compressed gas tanks empty. • When reassembling the blender, do not pressurize the system unless the valve seat has 3 full turns of thread engaged. The seat can be forcefully ejected by gas pressure if not sufficiently engaged. Do not exceed 3 full turns or the rear seat may be damaged.
4
L1130 Rev. C
Warnings, Cautions and Notes Cautions: • An air inlet filter/water trap (P/N 07426) is recommended for use with the MicroBlender to minimize the possibility of contaminants such as particulate debris or condensed water entering the blender or patient gas delivery system. • Do not steam autoclave or otherwise subject the Low Flow MicroBlender to temperatures above 145°F (62°C). • Do not immerse assembled blender in liquid decontamination agents. • When pressurizing the blender inlets, avoid excessive pressure surges (as could be caused by “Quick Dump” valves). Always use needle valves and pressurize inlets slowly. • Use recommended lubricants sparingly as lubricant may migrate to other areas and cause the Low Flow MicroBlender to malfunction.
Notes: • Users are advised to use pressure regulators that display regulated pressure.
• Allow equilibration time for FIO 2 changes before analyzing gas.
L1130 Rev. C
5
Section 3: Clinical Troubleshooting Problem Oxygen concentration discrepancy between blender setting and analyzer (greater than 3%).
Potential Cause
Flow requirements are outside the specified LPM range. Analyzer out of calibration. Blender out of calibration. Low flow bleed muffler obstructed causing restriction of fixed bleed. Gas supply contaminated.
Alarm sounding.
Low Flow MicroBlender in bypass. No Alarm.
Low Flow MicroBlender accurate only when inlet gas pressures are equal.
Air entrained into circuit by ventilator or accessory device. Inlet pressure differences of 20 PSI (1.41kg/cm 2) or more. Alarm module not calibrated properly. Inlet gas contamination, alarm module malfunction.
Alarm Reed Assembly (P/N 05436) improperly installed or damaged. Alarm gas orifice obstructed. Balance module not functioning properly.
6
Corrective Action Correct flow. Auxiliary outlet (right outlet) port flow range is 0-30 LPM. The Primary (left outlet) port is 3-30 LPM. Calibrate analyzer. Recalibrate or service further as necessary (see Section 4). Remove obstruction and verify bleed flow is within tolerance. Check source gases with calibrated O 2 analyzer to confirm O2 is 100% and AIR is 21%. Correct
Correct pressure difference. Recalibrate or service further as necessary (see Section 4). Disassemble, clean, reassemble, calibrate, install inlet filter/water trap on air line, and correct cause of gas contamination. Remove and replace.
Remove obstruction from orifice. Disassemble balance module, clean, replace diaphragms(s), reassemble and test.
L1130 Rev. C
Section 4: Service, Repair and Calibration
Figure 8, Low Flow MicroBlender (Air/Oxygen Blender) Components Illustration L1130 Rev. C
7
Service, Repair and Calibration Additional tools and supplies recommended for service/repair:
WARNING: The Low Flow
MicroBlender should be serviced and/ or calibrated by a CareFusion trained hospital/dealer service technician or CareFusion.
5/32" Allen wrench 1/8" Allen wrench 9/32" Hex nut driver 3/4" Open end or adjustable wrenches (2)
Caution: Before attempting to service/
11/16" Open end or adjustable wrench
repair the Low Flow MicroBlender, the service person should first be familiar with its design and operation as explained in Section 1 of this manual.
7/32" Allen wrench Small needle nose pliers Isopropyl Alcohol
A numbering system is utilized, so that one can easily identify the steps involved with each operation.
A Low Flow MicroBlender Maintenance Kit may be ordered by specifying P/N 10003. This kit includes all parts necessary for periodic preventive maintenance.
A. Service/Calibration Tools Assembling and disassembling the Low Flow MicroBlender requires special tools (shown in Figure 8), which are available from CareFusion individually or as a kit ( P/N 03852). Part No.
Description
00631
Lubricant
03850
Alignment Assembly Tool (2)
03849
Spanner Wrench
03851
Lubricant Grease
03884
Vibra-Tite Thread-locking Compound
10101
Tube Assembly, Leak Test
10102
Tube Assembly, Pressure Test
10108
Fitting, Bleed Test
10138
Blender Alarm Tool
CareFusion recommends using an ultrasonic cleaner for cleaning all components. However, cleaning with an all-purpose liquid cleaner and rinsing with clear, warm water may be substituted. Both methods require thoroughly blow drying all passages before final assembly. When using an ultrasonic cleaner, follow the manufacturers instructions.
8
L1130 Rev. C
Service, Repair and Calibration B. Disassembly/Reassembly Procedure (Figure 9 and 10)
Balance Block Reassembly 1.4 Holding diaphragm alignment tool (P/N 03850) in hand , place the “A” Block onto the alignment tool with the diaphragm cavity facing up.
Balance Regulators 1.0 Balance Block Disassembly/ Reassembly – Top of MicroBlender
1.5 Place diaphragm (P/N 03858A) into cavity.
1.1 With a 5/32" Allen wrench, remove the top four screws securing the two balance block assemblies to the valve block.
Note: Make sure poppet pin on diaphragm seats into diaphragm alignment tool (P/N 03850).
Note: The balance block assemblies are identical and interchangeable. For ease of assembly, the blocks may be labeled (A, B, C and D).
1.6 Place “B” block on top of assembly with diaphragm cavity facing down. Note: Align block assemblies for proper gas flow. Three holes on each block (bottom) must be aligned.
1.2 Using spanner wrench, remove the caps (2 each per balance block assembly). Remove O-rings and discard.
1.7 Insert second diaphragm alignment tool (P/N 03850) into Block “B”, making sure the poppet pin on diaphragm seats into alignment tool.
Note: Poppet spring and ball will be loose following removal of balance block cap. Remove components and set aside. 1.3 With a 5/32" Allen wrench, remove each of four (4) screws securing each pair of blocks. Remove the diaphragms and O-rings and discard.
03850 20807
Clean all parts with an ultrasonic cleaner. Ensure all passages are blown completely dry before beginning assembly. Be sure that the poppet seat areas are perfectly clean.
A 03858A
Balance block assembly replacement parts: Part No.
Qty.
00138
8
O-ring
03858A
2
Diaphragm
05186
4
O-ring
20807
Description
B 03850
Figure 9 L1130 Rev. C
9
Service, Repair and Calibration block cap. 1.8 Fasten block “A” and “B” together loosely with two (2) screws (P/N 03825).
Note: Lubricant on spring end ensures adherence of spring to cap during placement into block assembly.
1.9 Holding the two (2) diaphragm alignment tools in place, lay the entire assembly with one of it’s surfaces on a flat surface. This will align blocks properly for mating with valve block.
1.16 Install cap and spring into block assembly and tighten in place using spanner wrench. Torque to 30 in/lb.
1.10 Using a 5/32" Allen wrench, tighten the previously installed two (2) screws holding blocks “A” and “B” together. Torque to 60 in/ lb.
1.17 Place block assembly “AB” on opposite side and repeat steps 1.13 to 1.16. 1.18 Reassemble block “CD” using same procedure as “AB” beginning with Step 1.4.
1.11 Install and tighten, using a 5/32" Allen wrench, remaining two (2) screws (P/N 03825) to opposite side of “A” and “B” block assembly. Torque to 60 in/lb.
1.19 Lightly lubricate O-rings (P/N 00138) with lubricant (P/N 00631). 1.20 Place block assemblies and O-rings (P/N 00138) aside for final assembly.
1.12 Remove both diaphragm alignment tools and place “A” and “B” block assembly on its side.
Valve Block 2.0 Oxygen Inlet Disassembly/ Reassembly–Bottom Rear of MicroBlender
1.13 Place ball (P/N 00770) into seat. 1.14 Lightly lubricate O-ring (P/N 05186) with lubricant (P/N 00631) and install on Balance Block Cap (P/N 20877).
Note: This assembly threads into the block with a left-handed thread. A single groove on nut indicates left hand thread.
1.15 Place a very small amount of lubricant grease (P/N 03851) on one end of spring (P/N 31230), then install lubricated end into
2.1 With a 3/4" open end wrench, remove the oxygen inlet assembly from the valve block.
20877
2.2 Using a second 3/4" open end wrench, separate the O 2 connector from the filter retainer.
05186 31230
2.3 Use a 3/4" open end wrench to stabilize the filter retainer, then remove the O 2 tail piece using a 1/8" Allen wrench.
00770 20807
2.4 Remove the filter, duckbill check valve, O-rings and washer and discard. Note: The filter may have to be grasped with pliers to remove. Figure 10 10
L1130 Rev. C
Service, Repair and Calibration Note: Step on washer fits into duckbill check valve.
Clean all parts with an ultrasonic cleaner. Ensure all passages are blown completely dry before beginning reassembly.
2.7 Lightly lubricate O-rings (P/N 03808, 31030) with lubricant (P/N 00631) and assemble to O2 filter retainer (P/N 03835L).
Oxygen Inlet Reassembly Replacement parts:
2.8 Using two (2) 3/4" open end wrenches, tighten the O 2 connector to the filter retainer. Torque to 10 ft./lb.
Part No.
Qty.
Description
00143
1
O-ring
31030
1
O-ring
03808
2
O-ring
03895
1
Duckbill Check Valve
03897
1
Washer
06804
1
Inlet Cone Filter
2.9 Take unlubricated O-ring (P/N 00143) and assemble to O 2 tail piece (P/N 03837). 2.10 Insert O2 tail piece into nut (P/N 00822) and using a 1/8" Allen wrench, tighten to O 2 connector. Torque to 10 ft./lb. 2.11 Set O2 inlet aside for final assembly to vale block.
Note: Prior to installation, place a small amount of Vibra-Tite (P/N 03884) on threads of O2 Tailpiece (P/N 03837) and let Vibra-Tite dry for at least 10 minutes.
3.0 Air Inlet Disassembly/Reassembly – Bottom Rear of MicroBlender 3.1 With a 3/4" open end wrench, remove the air inlet assembly with O-ring. Remove and discard O-ring.
2.5 Lightly lubricate O-ring (P/N 03808) with lubricant (P/N 00631) and assemble to O 2 connector (P/N 03834).
3.2 Remove the inlet cone filter located in valve block and discard.
2.6 Insert duckbill check valve (P/N 03895), washer (P/N 03897) and cone filter (P/N 06804) into O 2 connector.
03808
03895
03834L
03897
Note: The filter may have to be grasped with pliers to remove. 3.3 Next, remove the washer and duckbill check valve from the valve block assembly. Discard check valve and washer. Clean all parts with ultrasonic cleaner. Ensure all passages are blown completely dry before beginning reassembly.
06804
03808 31030
03835L
00822
03837 00143 Figure 11 L1130 Rev. C
11
Service, Repair and Calibration Air Inlet Reassembly
Note: Small spring is loose and may fall out of cavity. 4.2 Remove poppet from the outlet, then remove O-ring from poppet and discard. 4.3 Remove O-ring from the outlet body and discard. Clean all parts with in an ultrasonic cleaner and rinse with clean, warm water. Ensure all passages are blown completely dry and that poppet seat areas are perfectly clean before beginning reassembly.
Primary Outlet Reassembly Figure 12 Replacement parts: Part No.
Qty.
Description
03808
1
O-ring
03895
1
Duckbill Check Valve
03897
1
Washer
06804
1
Inlet Cone Filter
3.4 Install lightly lubricated O-ring (P/N 03808) with lubricant (P/N 00631) on air inlet connection (P/N 03895).
Figure 13
3.5 Place inlet cone filter (P/N 06804) inside air inlet.
Replacement parts
3.6 Set air inlet aside with duckbill check valve (P/N 03895) and washer (P/N 03897) for final assembly to valve block.
Part No.
Qty.
00138
1
O-ring
05186
1
O-ring
Description
4.4 Lightly lubricate O-ring (P/N 05186) with lubricant (P/N 00631) and install on primary outlet housing (P/N 03838) and lubricated O-ring (P/N 00138) on poppet (P/N 03312).
4.0 Primary Outlet Disassembly/ Reassembly – Left Side Front of MicroBlender 4.1 With an 11/18" open end wrench, remove the primary outlet from the valve block.
4.5 Insert poppet into the outlet housing. 4.6 Set assembly with spring (P/N 03310) aside for final assembly.
12
L1130 Rev. C
Service, Repair and Calibration 5.0 Auxiliary Outlet Disassembly/ Reassembly – Right side, Front of MicroBlender
5.4 Lightly lubricate O-rings with lubricant (P/N 00631). Install lubricated O-rings (P/N’s 03808 and 00193) on auxiliary outlet housing (P/N 03930) and O-ring (P/N 00138) on poppet (P/N 03806).
5.1 Using an 11/16" open end wrench, remove the auxiliary outlet from the valve block assembly.
5.5 Insert poppet into auxiliary housing. 5.6 Set assembly with spring (P/N 03810) aside for final assembly.
Note: Small spring is loose and may fall out of cavity.
Proportioning Module
5.2 Remove poppet from auxiliary outlet, then remove and discard O-ring (P/N 00138).
6.0 Control Knob/Front and Rear Seat Valve Disassembly/Reassembly – Front of MicroBlender
5.3 Remove O-rings (P/N 03808 and 00193) from the outlet body (P/N 03930) and discard.
6.1 With thin blade screwdriver or knife, remove gray cover plate from knob assembly.
Clean all parts with an ultrasonic cleaner. Ensure all passages are blown completely dry and poppet seats are perfectly clean before beginning reassembly. Ensure orifice on Auxiliary outlet (P/N 03930) is not occluded.
6.2 Using a 9/32" nut driver, loosen nut just enough to remove knob assembly from front seat valve stem. 6.3 Remove and discard O-ring from front seat locknut. Using an 11/16" open end wrench, remove front seat lock nut. Remove front plate by gently separating from block assembly.
Auxiliary Outlet Reassembly
6.4 Using spanner wrench (P/N 03849), remove the front seat (incorporating valve stem). Remove O-rings and discard. Note: Small 1/8" ball may be loose and drop from assembly. 6.5 Rotate valve stem counterclockwise to remove from front seat. Remove O-rings from valve assembly and discard. 6.6 Carefully remove poppet valve and spring from rear seat.
Figure 14
6.7 Using a 1/8" Allen wrench, remove the rear seat and O-ring from valve body. Discard O-ring.
Replacement parts: Part No.
Qty.
Description
00138
1
O-ring
00193
1
O-ring
03808
1
O-ring
L1130 Rev. C
Clean all parts with an ultrasonic cleaner. Ensure all passages are blown completely dry before beginning reassembly. 13
Service, Repair and Calibration Control Knob/Front and Rear Seat Reassembly
6.10 Using lubricant (P/N 00631), lubricate O-ring (P/N 00306) and place into groove in valve stem (P/N 03928). 6.11 Install valve stem assembly (P/N 03928) into front seat (P/N 03926) and rotate valve stem clockwise until O-ring (P/N 00306) bottoms out. Rotate valve counterclockwise two turns. Repeat above procedure 10 times and ensure that valve stem movement is smooth, uniformly tight and without any detectable end play. 6.12 Back out stem, turn counterclockwise until valve stem O-ring (P/N 00306) is just inside the front seat (P/N 03926).
Figure 15
6.13 Using lubricant (P/N 00631), lubricate O-rings (P/N 00348, 00193) and install on front seat (P/N 03926).
Replacement parts: Part No.
Qty.
Description
00193
1
O-ring
00306
1
O-ring
00348
1
O-ring
05279
1
O-ring
07849
1
O-ring
5163B
1
Spring
6.14 Inspect proportional valve (P/N 03929) for scratches, nicks, wear and cleanliness. 6.15 Using lubricant (P/N 00631), lightly lubricate O-ring (P/N 07849) and install in groove of rear valve seat (P/N 03927). 6.16 Set valve stem/front seat assembly, rear seat proportional valve spring aside for final assembly.
6.8 Inspect valve seat faces carefully. They should have a sharp edge void of chamfer, nicks or wear. Replace if necessary.
7.0 Bypass Disassembly/Reassembly – Both sides, rear of MicroBlender
Caution: Any damage to seats may
7.1 Using a slender, pointed probe, remove sealant plug from both side caps.
prevent proper calibration.
7.2 Using an 1/8" Allen wrench, unscrew adjuster from left and right hand side bypass seats.
6.9 Install absolutely clean 1/8" ball (P/N 03931) into valve stem (P/N 03928).
7.3 Remove and discard O-ring from each adjuster.
Note: Do not use lubricants or any other substance as a means of securing ball into stem. The ball joint interface, consisting of ball (P/N 03931), stem (P/N 03928), and poppet valve (P/N 03929), MUST be kept clean and free of contaminants to insure accurate calibration. 14
L1130 Rev. C
Service, Repair and Calibration Alarm Bypass Reassembly
Note: A small spring is contained in each assembly and might remain in poppet bypass valve housing after adjuster has been removed.
05307 2 PL
7.4 Using a spanner wrench (P/N 03849), unscrew bypass sleeve from left rear side of valve block. Remove and discard O-rings.
21984
01943 2 PL
04897
04896 20895 2 PL
7.5 From right rear side of block, unscrew bypass seat. Remove and discard O-ring.
30514/04639B* 2PL
Note: If spring(s) are still in cavity, carefully remove them.
03817A 2 PL
00114 2 PL
* See Appendix: MicroBlender Bypass/Alarm Sleeve
Figure 16
7.6 Carefully push bypass poppet valve through bypass sleeve.
Replacement parts:
Note: Use a blunt slender probe to push poppet valve out of enclosure. Use care to avoid scratching surface of cylinder in which poppet valve operates. 7.7 Remove and discard O-rings from poppet valve.
Part No.
Qty.
00114
2
O-ring
01943
2
O-ring
30514/04639B* 2
O-ring
05307
O-ring
2
Description
7.8 Using lubricant (P/N 00631), lubricate (2) O-rings (P/N 01943). Install one (1) O-ring on bypass seat cap (P/N 04896) and one (1) O-ring on sleeve (P/N 04897).
Caution: Carefully inspect internal surfae of sleeve for any signs of wear and damage to the special coating.
7.9 Using lubricant (P/N 00631), lubricate two (2) O-rings (P/N 30514/04639B*) and install on sleeve (P/N 04897).
Clean all parts with an ultrasonic cleaner. Ensure all passages are blown completely dry before beginning reassembly.
7.10 Using lubricant (P/N 00631), lightly lubricate two (2) O-rings (P/N 00114) and install one (1) on each bypass adjuster (P/N 20895). 7.11 Thoroughly lubricate two (2) O-rings (P/N 05307) with lubricant grease (P/N 03851) and install one (1) in each groove at end of bypass poppet (P/N 21984) shoulder. 7.12 Set bypass seat assembly, sleeve assembly, bypass poppet assembly, adjuster springs (P/N 03817A) and adjuster assemblies aside for final assembly.
*See Appendix: MicroBlender Bypass/Alarm Sleeve. L1130 Rev. C
15
Service, Repair and Calibration 8.0 Outlet Cap Disassembly/Reassembly – Bottom, Front of MicroBlender 8.1 Using spanner wrench (P/N 03849), remove outlet cap and O-ring from valve block. Remove and discard O-ring.
Outlet Cap Reassembly Replacement Parts: Part No.
Qty.
05186
1
Figure 17
Description
Alarm Cap Reassembly
O-ring
Replacement parts
8.2 Lightly lubricate and install O-ring (P/N 05186) on cap (P/N 20877). Set aside for final assembly. 9.0 Muffler Disassembly – Bottom, Middle of MicroBlender
1
Star Retainer
03319
1
Muffler
1
Diffuser
05436
1
Alarm Cap
10.7 Set alarm assembly aside for final assembly.
Replacement Parts 03314
03903
10.6 Check alarm assembly for proper audible function.
Muffler Assembly Description
Description
10.5 Place diffuser (P/N 03903) into alarm cap above spring.
9.2 Remove muffler carefully with a pointed probe and discard.
Qty.
Qty.
10.4 Install spring (P/N 31000) with its wide base on top of reed inside alarm cap (P/N 05326).
9.1 With a small screwdriver, carefully lift star retainer from bottom of valve block. Discard star retainer.
Part No.
Part No.
11.0 Alarm Check Valve Disassembly/ Reassembly – Rear of MicroBlender 11.1 With spanner wrench (P/N 03849) remove cap from rear of valve block.
9.3 Set muffler (P/N 03319) and retainer (P/N 03314) aside for final assembly.
11.2 Remove and discard O-ring from cap.
10.0 Alarm Disassembly/Reassembly – Bottom, Middle of MicroBlender
11.3 Using a 5/32" Allen wrench, remove checkball retainer, rubber checkball and spring.
10.1 Using blender alarm wrench (P/N 10138), unscrew alarm cap.
11.4 Remove and discard O-ring and rubber checkball.
10.2 Remove diffuser foam and discard. 10.3 Remove spring.
Clean all parts with an ultrasonic cleaner. Ensure all passages are blown completely dry before beginning reassembly. 16
L1130 Rev. C