Graco GM 3500 Instructions-Parts List Manual page 18

WARNING
To reduce the risk of serious bodily injury, always fol-
low the Pressure Relief Procedure Warning on
page 13 before repairing the sprayer.
Removing the pump. See Fig 18–1.
1. Flush the pump. Relieve pressure.
2. Hold the intake valve (223) with a wrench and
unscrew the suction tube (30). Remove the
hose (59). For upright carts, remove the
spring clips (101,103) and drain hose (102).
3. Push the retaining spring (26) up. Push the
pin (25 ) out the rear.
4. Loosen the locknut (27). Unscrew the pump.
21
26
224
25
27
101
30
Fig 18–1
Disassembling the pump.
1. Unscrew the intake valve (223) and remove
all parts. See Fig 18–1.
2. Remove the plug (205). Unscrew the packing
nut (216). See Fig 18–2.
3. Tap the piston rod (224) down and then pull
it out the bottom of the cylinder (219). See Fig
18–2.
205
216
*209
*213
207*
*208
Fig 18–2
DISPLACEMENT PUMP
219
57
221*
220
59
204*
202*
223
102
103
219
224
211
222
*209
*207
LEATHER
LIPS MUST
FACE DOWN
*208
*202
218
*206
LEATHER
LIPS MUST
FACE UP
*203
LIPS OF
U–CUP
SEAL
MUST FACE
DOWN
*202
Fig 18–3
4. Remove the throat packings. See Fig 18–2.
5. Clamp the flats of the piston rod (224) in a vise. Loos-
en the piston (222). Unscrew the nut (211) from the
piston. Remove the piston packings.
224
205
216
27
213*
POLY
LIPS
MUST
FACE
DOWN
219
210*
212*
POLY
LIPS
MUST
FACE UP
215*
214*
223
TORQUE TO:
64 N.m
(48 ft–lb)
0085