Repair
12 308485R
Repair
Air Motor and Throat
Refer to FIG. 3 for the following instructions.
Disassembly
Two accessory tools should be used: Padded Pliers,
207579, are used to grip the trip rod without damaging
the surface, and a 0.125 in. (3.18 mm) Gauge, 171818,
is used to assure the proper clearance between the
poppets and seat of the piston.
1. Flush the pump.
2. Relieve pressure. Follow the Pressure Relief
Procedure, page 8.
3. Disconnect the hoses, remove the pump from its
mounting, and clamp the air motor base (28) in a
vise horizontally by closing the vise jaws on the
flange.
4. Use a strap wrench on the displacement pump
cylinder (110) to unscrew it out of the air motor
base (28).
5. Remove the air motor base from the vise, and place
the piston rod (29) flats in the vise with the air motor
facing up.
6. Loosen the lift ring (24). Pull up the lift ring, grip the
trip rod (31) with the padded pliers, and screw the
lift ring off of the rod.
7. Remove the piston ball (103), the u-cup packing
(107†), and the piston washer (113).
8. Remove the six screws (3) holding the cylinder (30)
to the base (28). Carefully pull the cylinder straight
up off of the piston assembly (27).
†Included in Pump Repair Kit 238225, which may be
purchased separately.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid and moving parts, follow the Pressure Relief
Procedure when you stop dispensing and before
cleaning, checking, or servicing the equipment.
NOTICE
Do not damage the plated surface of the trip rod (31).
Damaging the surface of the trip rod can result in
erratic air motor operation. Use the padded pliers
(207579) to grasp the rod.
NOTICE
Lift the cylinder straight up off of the piston to avoid
damaging the cylinder wall. Never tilt the cylinder as it
is being removed.
FIG. 3
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