Displacement Pump - Graco LineLazer IV 3900 Repair Parts List Manual

Displacement Pump

Removal
1. Flush pump.
2. Relieve pressure, page 6.
3. F . 15. Cycle pump piston rod (A) to lowest position.
IG
4. F . 15. Remove suction tube (34) and hose (100).
IG
100
34
F . 15
IG
5. F . 16. Use screwdriver: push retaining spring up
IG
and push out pin (235).
TI7675b
F . 16
IG
6. F . 17. Loosen locknut by hitting firmly with a 20 oz
IG
(maximum) hammer. Unscrew pump.
F . 17
IG
7. See manual 310643 for pump repair instructions.
312195B
A
TI7672c
235
TI7673b
Installation
If pin works loose, parts could break off due to force of
pumping action. Parts could project through the air and
result in serious injury or property damage. Make sure
pin and retaining spring are properly installed.
CAUTION
If the pump locknut loosens during operation, the
threads of the bearing housing will be damaged.
Make sure locknut is properly tightened.
1. F . 18. Pull piston rod out 1.5 in. Screw in pump
IG
until holes in bearing cross link and piston rod align.
F . 18
IG
2. F . 16. Push pin (235) into hole. Push retaining
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spring into groove around connecting rod.
3. F . 19. Screw jam nut onto pump until nut stops. Screw
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pump into bearing housing until stopped by jam nut.
Back off pump and jam nut to align pump outlet to back.
Hand tighten jam nut; then tap 1/8 - 1/4 turn with a 20 oz
hammer to approximately 75 +/- 5 ft-lb (102 N•m).
F . 19
IG
4. F . 20. Fill packing nut with Graco TSL until fluid
IG
flows onto the top of seal.
F . 20
IG
Displacement Pump
1.5 in.
TI7676b
TI7673b
TI7677b
21