10
307552
Service
Disconnecting the Air Motor
Flush the pump, disconnect the air supply and relieve all
pressures in the system. Remove the pump from its
mounting. Unscrew the tie rod locknuts (3), remove the
screw (5) and barrel (4) set and lift the air motor.
Unscrew the rod (34). See Fig 6.
Reconnecting the Air Motor
Use lithium base grease on the threads of the rod (34).
Insert the muffler (P) as shown. Hand tighten the rod (34)
into the air motor connecting rod. Install the screw and
barrel set (4 and 5). Lubricate the tie rod threads. To
ensure alignment, thread the tie rod locknuts (3) loosely
onto the tie rods, then torque evenly to 11 N•m (8 ft–lb).
See Fig 6.
Intake Valve
Unscrew the intake valve housing (35). Disassemble,
clean and inspect all parts. Replace worn or damaged
parts. See Fig 7.
Piston Valve
Use a strap wrench to grip the cylinder (25) near the
housing (24) and unscrew it from the outlet housing. Pull
the cylinder down, then loosen the lower nut (19).
Unscrew the piston housing (33). Clean and inspect all
parts. Replace worn or damaged parts. Screw the
connecting rod all the way into the piston housing (33).
Tighten the upper nut (19) against the piston housing and
adjust the lower nut (19) to allow the piston disk (29) free
travel of 3.1 mm (0.1235 in.). See Fig 7.
Throat Packings
Remove the cylinder (25). Loosen the packing nut (28).
Pull the displacement rod (34) down and out. Remove
the glands (21,22) and packings (32). Clean and inspect
all parts. Replace worn or damage parts.
Reassemble the pump. Install packings one at a time to
be sure they nest properly. Leave the packing nut (28)
loosen until the displacement rod (34) has been
installed. Then tighten the packing nut firmly to seat the
packings.
NOTE:
Insert the displacement rod from the top of the
outlet housing (24) to prevent packing damage.
Back the packing nut off until it no longer contacts the
packings, then turn it in just until contact is made.
03766B
FIG.
6
TORQUE TO
11 N•m (8 ft–lb)
