Displacement Pump Repair - Graco Ultra 1500 Mark V 236-401 Instructions-Parts List Manual

Displacement Pump Repair

Removing the pump
1. Flush the pump, if possible. Relieve the pressure.
Stop the pump with the piston rod in its lowest po-
sition, if possible.
2. Remove the hose (47).
3. Remove the intake screen (99).
4. Push the retaining spring (35) up and push out the
pin (20).
5. Loosen the locknut (38). Unscrew the pump from
the bearing housing (27) by one half turn.
6. Remove the check valve assembly (A) from the
pump.
7. Remove the pump.
Installing the pump
1. Screw the pump into the bearing housing (27) until
the pin holes in the connecting rod assembly (29)
and the displacement rod (224) are aligned. Install
the pin (20).
2. Continue to screw the pump into the bearing hous-
ing until the top threads of the pump cylinder are
even with the face of the bearing housing and the
pump outlet faces straight back. Unscrew the
pump one half turn so the pump outlet is at the
side. Push the retaining spring (35) into the groove
all the way around the connecting rod. Tighten the
locknut (38) to 95 N.m (70 ft-lb).
WARNING
Push the retaining spring (35) completely and firmly
into the groove around the connecting rod to pre-
vent it from working loose due to vibration.
If the pin works loose, the pin or other parts could
break off as the pump operates. The broken parts
could damage the sprayer or they could be pro-
pelled toward the operator and cause a serious
injury.
CAUTION
If the locknut (38) loosens during operation, the
threads of the bearing housing (27) will be dam-
aged. Ttighten the locknut firmly.
See Fig. 13.
See Fig. 13 and 14.
3. Install the intake screen (99). See Fig. 13..
4. Install the check valve assembly (A).
5. Tighten the wet-cup just enough to stop leakage,
but no tighter. Fill the wet–cup with Graco TSL
until it is 1/3 full.
27
35
224
20
38
39
99
Fig. 13
Torque to the nut to 95 N.m. (70 ft–lb).
This is the face of the
bearing housing.
29
27
Fig. 14
47
A
20
35
38