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Repair
Pressure Relief Procedure
Trapped pressure can cause the pump to cycle unex-
pectedly, which could result in serious injury from
splashing or moving parts.
1. Engage trigger lock.
2. Shutoff the pump:
a. For air-powered pumps, close the bleed-type
master air valve.
b. For hydraulic-powered pumps, close the supply
line shutoff valve (U) first, then close the return
line shutoff valve (V).
3. Disengage the trigger lock.
4. Hold a metal part of the gun firmly to a grounded
metal pail. Trigger the gun to relieve pressure.
5. Engage the trigger lock.
6. Open all fluid drain valves in the system, having a
waste container ready to catch drainage. Leave
drain valve(s) open until you are ready to spray
again.
7. If you suspect the spray tip or hose is clogged or
that pressure has not been fully relieved after follow-
ing the steps above, VERY SLOWLY loosen tip
guard retaining nut or hose end coupling to relieve
pressure gradually, then loosen completely. Clear
hose or tip obstruction.
3A0022A
Required Tools
•
Set of socket wrenches
•
Set of adjustable wrenches
•
24 in. adjustable wrench
•
Torque wrench
•
Rubber mallet
•
Arbor press
•
Soft wooden block (approx. 1 square foot in size)
•
Large vise, with soft jaws
•
Thread lubricant
•
Anti-seize lubricant 222955
®
™
•
Loctite
2760
or equivalent
Disassembly
Lay out all the removed parts in sequence, to ease reas-
sembly. Clean all parts with a compatible solvent and
inspect them for wear or damage. Refer to F
8.
1. Flush the pump, if possible. Stop the pump at the
bottom of its stroke. Relieve the pressure.
2. Disconnect the lower from the motor. See your sep-
arate pump assembly manual.
3. Stand the lower upright and clamp bottom inlet
housing (15) in a large vise. Loosen, but do not
remove, the packing nut (3). Remove the six long
cap screws (18).
4. Lift the outlet housing (17) straight up off the lower.
Be careful not to scratch the displacement rod (1)
while removing the housing.
5. Lift the cylinder (7), displacement rod (1), and piston
assembly off the intake housing (15).
6. Remove the seal (6), ball guide (12), intake ball
(14), intake seat housing (15), and o-ring (24) from
the intake housing (15). Inspect the ball (14) and the
ball seat (A) on the housing (15) for wear or dam-
age.
7. Remove the seal (6) from the bottom of the outlet
housing (17). Unscrew the wetcup (3).
Repair
. 2, page
IG
5
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