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308048 7
Service
Pressure Relief Procedure
WARNING
SKIN INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure
whenever you:
D are instructed to relieve the pressure,
D stop spraying,
D check or service any of the system equipment,
D or install or clean the spray tip.
1. Lock the gun trigger safety.
2. Shut off the hydraulic power supply.
3. Close the supply line shutoff valve, and then the
return line shutoff valve.
4. Unlock the gun trigger safety.
5. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun to relieve
pressure.
6. Lock the gun trigger safety.
7. Open the drain valve (required in your system),
having a container ready to catch the drainage.
8. Leave the drain valve open until you are ready to
spray again.
If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above, very slowly loosen the
tip guard retaining nut or hose end coupling and relieve
pressure gradually, then loosen completely. Now clear
the obstruction.
Before you start:
Be sure you have all necessary parts on hand.
1. Repair Kit 223654 is available. The kit must be
purchased separately. An asterisk behind a refer-
ence number in the parts list, for example (21*),
indicates that the part is included in the repair kit.
2. Clean all parts as you disassemble them and
inspect them for wear or damage. Replace parts
as necessary. Use Loctiter TL–242 thread
sealant, or the equivalent, when thread sealant is
specified.
Disassembly (Refer to Fig. 3)
NOTE: Use all the replacement parts that are in the
repair kit.
1. Flush the displacement pump if possible.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
2. Relieve the pressure.
3. Stop the pump at the bottom of its stroke.
NOTICE
Avoid getting dust or dirt in the motor during service.
Cleanliness is essential when repairing an hydraulic
motor.
4. Disconnect the displacement pump hoses. Discon-
nect the hydraulic hoses and plug all hydraulic
connections and lines to prevent contamination.