Displacement Pump Service - Graco Fire-Ball 300 D Series Instructions Manual

Repair
Repair

Displacement Pump Service

Refer to F . 3 for the following instructions.
IG
Be sure you have all necessary parts on hand before
starting. Use all parts in the repair kit for best results.
Displacement Pump Repair Kit 241623 is available.
1. Flush the pump.
2. Relieve the pressure before proceeding, page 5.
3. Disconnect the hoses, remove the pump from its
mounting, and clamp the air motor base (5) in a
vise.
To avoid damaging the shovel tube, do not use slots
in the tube to tighten or loosen tube.
4. Use strap wrench to screw shovel tube (67) off of
pump cylinder (59).
5. Use strap wrench to screw shovel (66) off of shovel
rod (58).
6. se strap wrench on pump cylinder (59) to screw it
out of extension tube (64). Screw tube connector
(63) out of pump cylinder. Remove bearing (61) and
seal (62).
7. Screw the shovel rod (58) out of the piston (52).
Remove the lower ball (56). Screw the piston out of
the extension rod (57). Remove the upper ball (56),
retaining washer (53), and seal (54).
8. Clean all the parts in a compatible solvent and
inspect them for wear or damage. Use all the parts
in the repair kit, and replace other parts as neces-
sary.
9. Generously lubricate all the parts with light
water-resistant grease and reassemble the pump.
6
NOTICE
NOTE: Torque the shovel tube (67) to the pump cylinder
(59) at 45 to 55 ft-lbs (61 to 75 N.m).
Torque the pump cylinder (59) to the extension tube (64)
at 45 to 55 ft-lbs (61 to 75 N.m).
Torque the shovel rod (58) to the piston (52) at 25 to 30
ft-lbs (34 to 41 N.m).
Torque the piston (52) to the extension rod (57) at 25 to
30 ft-lbs (34 to 41 N.m).
10. If the ground wire was disconnected before servic-
ing, be sure to reconnect it before you operate the
pump.
308883S