Repair; Air Motor And Throat; Disassembly - Graco D Series Instructions And Parts List

Repair

Repair
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.

Air Motor and Throat

Refer to F . 3 for the following instructions.
IG

Disassembly

Two accessory tools should be used: Padded Pliers,
270579, 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.
12
4. Use a strap wrench on the displacement pump
cylinder (110) to unscrew it out of the air motor
base (28).
5. Remove the piston/valve seat (109) from the rod
(29) with wrenches or with the vise and a wrench.
6. Remove the piston ball (103), u-cup packing (107†),
and piston washer (113).
7. Remove the air motor base from the vise, and place
the piston rod (29) flats in the vise with the air motor
facing up.
8. 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.
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.
9. Remove the eight screws (3) holding the cylinder
(30) to the base (28). Carefully pull the cylinder
straight up off of the piston assembly (27).
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.
308608L