Service
Displacement Pump Service
Disassembly
When disassembling the pump, lay out all removed parts in sequence to ease reassembly. See Fig. 4.
NOTES
DStandard Repair Kit 224403 (UHMWPE/PTFE packings) is available. For the best results, use all the new parts in the kit. Parts included in the kit are denoted with one asterisk, for example (2*).
DConversion Kit 224889 is available to convert the pump to all PTFE packings. See page 18.
DClean all the parts thoroughly when disassembling. Check them carefully for damage or wear, replacing parts as needed.
1.Remove the displacement pump from the air motor as explained on page 14.
2.Unscrew the locking ring (20) from the cylinder
(15).See Fig. 4. Remove the intake valve housing
3.Remove the
(18)from the intake valve housing (21).
4.Unscrew the cylinder (15) from the outlet housing (5), note its orientation and carefully pull the cylin- der off the pump. Remove the
NOTE: It is important to replace the cylinder in the same orientation as both ends are NOT alike. Failure to install correctly may result in failure of pump or premature seal wear. For instructions on how to verify correct orientation, see NOTE in step 7 on page 16.
5.Loosen the packing nut (14), then pull the dis- placement rod (1) and connecting rod (8) out the bottom of the outlet housing (5).
6.Secure the flats of the displacement rod (1) in a vise. Unscrew the coupling nut (7) from the dis- placement rod. Remove the connecting rod (8) and attached parts.
7.Place the flats of the piston mounting stud (13) in a vise. Loosen the jam nut (9) and unscrew the adapter (10) from the piston mounting stud (13). Set the connecting rod (8) aside. Remove one cotter pin (12) and the ball stop pin (11), taking not which set of holes it is in. Then remove the ball (16).
8.Unscrew the piston stud (27) from the piston mounting stud (13). Remove the piston packings (29, 30), glands (28, 31) , shims (35), and washer (26).
9.Remove the packing nut (14), throat packings (3, 25), and glands (2, 4) from the outlet housing (5).
10.Inspect all parts for damage. Clean all parts and threads with a compatible solvent before reassem- bling. Inspect the polished outer surface of the displacement rod (1) and inner surface of the cylinder (15) for scratches, scoring, or other dam- age, which can cause premature packing wear and leaking. To check, run a finger over the surface or hold the part up to the light at an angle. Be sure the ball seats of the piston (27) and intake valve housing (21) are not chipped or nicked. Replace any worn or damaged parts.