Pump Repair
10
333397A
Reconnect the Displacement
Pump
1.
See F
. 13, page 20. Orient the pump fluid outlet
(D) to the air motor air inlet (214) as explained in
step 4 in
Disconnect the Displacement Pump
(page 9).
2.
See F
. 11, page 17. Position the displacement
pump (2) on the tie rods (3).
3.
Screw the tie rod nuts (4) onto the tie rods (3)
loosely.
4.
Install coupler nut and collars onto displacement
rod. Hold the flats of the air motor position rod with a
wrench. use another wrench to tighten the coupling.
nut (9).
5.
See F
IG
. 1, page 4. Apply thread sealant to the
pump fluid outlet (D) and the threads of the fluid
hose. Mount the pump and reconnect all hoses.
Reconnect the ground wire if it was disconnected
during repair. Torque the enclosed wet cup (B) to 60
ft-lb (81 N•m). Fill the wet cup fill port (C) with Graco
TSL.
6.
Tighten the tie rod nuts (4) evenly, and torque to
15-20 ft-lb (20-27 N•m).
7.
Start the pump and run it at approximately 40 psi
(2.8 bar) air pressure, to check that it is operating
properly.
8.
Check for fluid leakage at the enclosed wet cup (B).
Perform
Pressure Relief Procedure
, page 5.
Disassemble the Displacement
Pump
When disassembling the pump, lay out all removed
parts in sequence, to ease reassembly. See page 12.
NOTE:
Repair Kit 17B186 (Neoprene/UHMWPE pack-
ings) is available. For the best results, use all of the new
parts in the kit. Parts included in the kit are marked with
one asterisk, for example (1*).
Clean all of the parts thoroughly when disassembling.
Check parts carefully for damage or wear. Replace
parts as needed.
1.
Remove the displacement pump from the air motor
as explained on page 9.
2.
See F
. 12, page 18. Unscrew the locking ring
(117) from the cylinder (111). Remove the intake
valve housing (113).
3.
Remove the o-ring (112), ball stop pin (105), ball
guide (122) and ball (102) from the intake valve
housing (113).
4.
Loosen the enclosed wet cup (115). Push the dis-
placement rod (107) down as far as possible, then
pull it out from the bottom of the cylinder (111).
5.
Secure the flats of the displacement rod (107) in a
vise. Use a wrench on the flats of the piston mount-
ing stud (28), and screw the piston off of the rod.
Remove one cotter pin (101) and the ball stop pin
(110). Take note which set of holes it is in, then
remove the ball (102).
6.
Place the flats of the piston mounting stud (128) in a
vise, and unscrew the piston stud (114). Remove
the piston packings (125), glands (124, 127), shim
(129), and washer (123).
7.
Remove the enclosed wet cup (115), throat pack-
ings (109, 119) and glands (106, 108) from the out-
let housing (116).
NOTE:
Throat packings are
spring loaded. Be careful when removing the throat
packings or they could fall to the floor and become
dirty.
8.
Inspect all parts for damage. Clean all parts and
threads with a compatible solvent before reassem-
bling. Replace any worn or damaged parts.
9.
Inspect the polished surfaces of the displacement
rod (107) and cylinder (111) for scratches, scoring
or other damage, which can cause premature pack-
ing wear and leaks. To check, run a finger over the
surface or hold the part up to the light at an angle.
10. Be sure the piston stud (114) and intake valve hous-
ing (113) are not chipped or nicked.