Air Motor And Throat Service - Graco Presiden 237 Instructions-Parts List Manual

Air Motor and Throat Service
Before
You Start
0
Be sure you have all necessary parts on hand.
Air Motor Repair Kit 207485 includes repair parts
for the motor. Use all the parts in the kit for the
with one asterisk, for example (19.).
in
the text and
best results. Parts included in the kit are marked
drawings. See the Parts List on pagel5.
Two accessory tools should be used Padded
without damaging its surface, and a 0.145-in.
Pliers, 207-579, are used to grip the trip rod
(3.7 mm) Gauge, 171-818, is used to assure the
the piston.
proper clearance between the poppets and seat of
Disassembly
1. Flush the pump. Follow the Pressure Relief
Procedure on page 8 before proceeding.
2. Disconnect the hoses, remove the pump from its
mounting, and clamp the air motor base (28)
in
a
vise horizontally by closing the vice jaws on the
flange.
3. Use a strap wrench on the displacement pump
cylinder (110) to screw it out of the air motor base
(28). See Fig. 3.
4. Remove the pistonhalve seat (109) from the rod
(29) with wrenches
or
with the vice and a wrench.
5. Remove the piston ball (103), u-cup packing
(107t), and piston washer (113).
6.
Remove the air motor base from the vice, and
place the piston rod (29) flats in the vice with the
air motor up.
7. Loosen the lift ring (24). Pull the lift ring up, grip
the trip rod (31) with the padded pliers, and screw
the lift ring off of the rod.
A
CAUTION
I
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
special padded pliers, 207-579, to grasp the rod.
8. Remove the six screws (3) holding the cylinder
(30) to
the
base (28). Carefully pull the cylinder
straight up
off
of the piston (53).
I
A
CAUTION
I
To avoid damaging the cylinder wall, lift the cylinder
straight up off o f
the piston. Never tilt the cylinder
as it is being removed.
9. Remove the pistonbase from the vise, and set it
upright on the workbench.
31
19*
53
20*
3
28
103
113
107t
109
110
30
29
l o t
flange
W692
Fig.
3
t
Included in Repair Kit 2 3 7 - 6 0 2 .
10
308-485