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Pump Seal/Gasket
Rack Conveyor Dishmachine
Maintenance Instructions
Replacement
07610-003-05-59 A
April 25, 2005
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Jackson rack conveyor machines come equipped with
powerful motors and pumps to ensure ware washing results.
Occasionally, some of the parts on these components may need
replacing to maintain optimum performance. Two components in
particular are the wash pump gasket and the mechanical seal.
Jackson offers all of the repair parts necessary for performing this task.
The instructions provided here are for maintenance personnel only. Unauthorized persons should not attempt any of the
steps contained in these instructions.
Warning: many of the instructions and steps within
this document require the use of tools. Only authorized per sonnel should ever perform any maintenance procedure on
the dishmachine!
PREPARATION
1. Power must be secured to the unit at the service breaker. Tag or lock out the service breaker to prevent accidental or
unauthorized energizing of the machine.
2. Ensure that incoming water to the machine is secured
either by use of a shut-off valve or disconnecting the incoming
water line.
3. Ensure that the dishmachine has been completely
drained of water and has been allowed to cool down prior to beginning this maintenance procedure.
STEPS
1. Note: in this procedure, it is not necessary to always remove the
wiring from the motor. However, the motor should be treated with
the greatest of care when being pulled away and set on the floor
for maintenance, as demonstrated in these instructions.
2. Remove the (4) nuts holding the mounting plate in position.
Removing the mounting plate nuts with the 9/16” socket
TOOLS REQUIRED
The following tools will be needed to perform this mainte-
nance evolution:
1. 7/16” socket and ratchet with extension
2. 9/16” socket and ratchet with extension
3. 5/16” Allen wrench
4. 5/16” nutdriver
5. Large flathead screwdriver
TIME REQUIRED
It is estimated that it will take (1) person one and a half
hours to perform this task, not including all of the items indicated in
the section entitled “PREPARATION”.
IMPORTANT NOTES
1. Read these instructions thoroughly before attempting
this maintenance procedure. Become familiar with the parts and
what actions need to be taken. This will save time in the long run!
2. The procedures demonstrated in this manual are
shown being performed on an AJ-44 rack conveyor dishmachine.
The actual maintenance steps, however, apply to any wash, prewash or power rinse motor found on a Jackson rack conveyor dishmachine.
3. Loosen the band clamp on the back end of the motor.
Loosening the band clamp on the back end of the motor.
4. With the band clamp loosened, carefully remove it from the back
end of the motor. Once the clamp is removed, examine it to determine if it needs to be replaced as well. If it is broken in any spots
or shows signs of metal fatigue, it is best to order a new one. The
purpose of the clamp and the attached support bracket is to keep
the weight of the motor from pulling on the tub, damaging it. It is
absolutely necessary that this component be replaced once the
maintenance procedure is completed.
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Rack Conveyor Motor Seal and Gasket Replacementt Instructions
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Removing the rear clamp
5. Remove the motor support bracket.
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8. Using a large screwdriver (flathead preferred, but a phillipshead
will work just as well) and the 7/16” socket, loosen and then
remove the bolt holding the impeller to motor shaft. Refer to the
picture below.
Removing the bolt that holds the impeller to the shaft
9. With the bolt and washer removed, grasp the sides of the
impeller and pull up gently. The impeller should slide off of the
shaft. Remove the woodruff key as well and set to the side.
Removing the motor support bracket
6. With the motor support bracket removed, gently pull back on the
motor. You may have to move it from side to side, but it should start
to move back. Pull it completely away from the mounting studs on
the tub and set down gently to work on it.
7. Remove the gasket from the tub. If you are going to replace it
with a new one, do so at this time. Otherwise, carefully examine
the gasket for tears and other damage. If it is acceptable, set to the
side. If you are not going to replace the seal, go to step 16.
Removing the pump gasket
Removing the impeller
Removing the woodruff key
Rack Conveyor Motor Seal and Gasket Replacementt Instructions
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10. Note that the mechanical seal will consist of the following parts:
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2
3
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Mechanical Seal
1. A rubber seal with a ceramic ring set inside it that will
seat in the center of the mounting plate.
2. A rubber seal with a stainless steel covering on the out side that seals the motor shaft and seats against the ceramic ring.
3. A spring.
4. A stainless steel spring cap to capture the top of the
spring and hold it in place.
AFTER MAINTENANCE ACTIONS
Reconnect the incoming water (if disconnected) and turn
on. Then restore power to the unit. Run the unit for at least 10 minutes to ensure there are no leaks. If you hear any grinding sounds
while the motor is running, immediately shut off the unit and secure
power and water. There is a serious problem that must be
addressed. If any problems arise you can contact Jackson
Technical Service.
SPECIAL NOTES
Work performed on Jackson dishmachines by unautho rized or unqualified personnel may void the warranty. Before beginning this or any other maintenance evolution on a unit under warranty, you should contact a certified Jackson technician or Jackson
Technical Service. You can find a list of qualified service agencies
in the back of you unit’s installation manual.
SPECIAL PARTS
Mechanical Seal
Part number 5330-011-71-98
Motor Mounting Gasket
Part number 5330-011-71-62
Motor Support Clamp
Part number 4730-002-32-15
11. Most of the mechanical seal should simply come off, leaving
the rubber seal with the ceramic ring inside the pump mounting
plate.
12. Using a screwdriver, pry out the remaining part of the mechan ical seal, taking care not to score or damage the motor shaft.
13. Once the hole is free of any parts of the mechanical seal, verify that the hole is clean and free of debris.
14.Gently press the new seal and ceramic over the shaft and slide
down into the mounting plate hole. NOTE: Do not touch the surface
of the seal with your bare fingers; place a rag or paper towle
between your fingers and the seal. Gently slide the shaft seal over
the shaft and push it down against the mounting plate seal. Place
the spring and cap over the shaft.
15. Place the woodruff key back into the groove of the motor shaft
and re-install the impeller, being careful to align the woodruff key
with the slot in the impeller. Replace the bolt and washer, then
tighten.
16. Install the motor by placing it on the studs and sliding it forward
until it is against the wash tank wall. Replace the nuts and washers and tighten.
17. Re-install the pump motor support bracket and tighten down
the nuts used to secure it to the tub.
CONTACT INFORMATION
Jackson MSC Inc. provides technical support for all of the
dishmachines detailed in this manual. We strongly recommend that
you refer to this manual before making a call to our technical sup port staff. Please have this manual with you when you call so that
our staff can refer you, if necessary, to the proper page. Technical
support is available from 8:00 a.m. to 5:00 p.m. (EST), Monday
through Friday. Technical support is not available on holidays.
Contact technical support toll free at 1-888-800-5672. Please
remember that technical support is available for service personnel
only.
18. Replace the band clamp on the motor and support bracket,
tighten until snug.
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Rack Conveyor Motor Seal and Gasket Replacementt Instructions
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Motor
Key
Capscrews
Motor Assembly Diagram
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Mounting Plate
Mechanical Seal
Washer
Impeller
Bolt
Rack Conveyor Motor Seal and Gasket Replacementt Instructions
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