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WARNING
Always follow the
Pressure Relief Procedure
Warning on page 8 before doing any repair.
Inlet Valve (See Fig 7)
1. Remove the suction hose (44). Remove the inlet
valve (1). Remove the gasket (3).
2. Reinstall the gasket on the new inlet valve. Install the
valve. Torque to 480 in–lb (54 N.m).
NOTE: To torque the inlet valve, have someone firmly
hold the pump housing (9).
Diaphragm (See Fig 8)
CAUTION
Replace the diaphragm whenever you remove the
pump housing (9) or after each 100 hours of use,
whichever comes first. During use, small grooves
are formed in the diaphragm which cannot be re-
aligned properly. Reusing a diaphragm may cause
leaking which will result in costly damage to the
pump.
1. Remove the pump base cover (42). Remove the
screws (28), handle (32) and shield (79). Refer to the
Parts Drawing.
2. Remove the screws (15) and lockwashers (16). T ip
the pump housing (9) back. Be careful not to damage
the wires. Remove the front cover (23).
3. Check the diaphragm guide (11) for wear or damage.
If replacing the guide, clean the pump housing thor-
oughly. Use your fingers to press the new guide, flat
side first, evenly into the housing.
4. Screw the diaphragm (17) out of the connecting rod
assembly (18).
5. Use a soft brass or nylon bristle brush to clean the top
of the connecting rod and housing. Gently clean the
bottom of the pump housing (9), avoiding damage to
the diaphragm grooves.
6. Check the rod, motor bearing and eccentric for paint
residue. If there is paint residue or damage, clean or
replace the connecting rod assembly as explained
on page 14.
7. Screw the new diaphragm (17) into the connecting
rod just until it bottoms out. Then turn it 1/4 to 1/2 turn
(6–8 in–lb [2.7–3.6 N.m]).
CAUTION
Never turn the diaphragm more than 1/2 turn when
torquing it, as that will prevent the diaphragm from
working properly.
8. Apply thread lubricant to the screws (15). Install the
screws and lockwashers (16) in the pump housing.
Torque the screws a few inch–pounds at a time, op-
positely and evenly, until there is 85 in–lb (9.7 N.m)
of torque on each screw.
9. Spin the motor shaft (D) to be sure it turns freely.
10. Reinstall the front cover (23), handle (32 and screws
(28), and the shield (79).
307–959
SPRAYER REPAIR
TORQUE TO
480 in–lb
(54 N.m)
Fig 7
LUBRICATE
THREADS.
TORQUE TO
85 in–lb
(9.7 N.m)
18
Fig 8
44
1
3
44
15,16
47
45
11
17
9
24
23
46
9
D
23
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