Service
10
307906ZAA
Pump Lower Repair
See F
IG
. 3, page 11.
1.
Use a strap wrench on the fluid cylinder (24) to
unscrew it from the motor base (5). Pull down on the
piston rod (10) until you have access to the fluid pis-
ton assembly (19).
2.
Remove the fluid piston (19) from the piston rod (10)
by holding the piston rod stationary while turning the
fluid piston out. Be careful to not drop the check ball
(18).
3.
Use a strap wrench to unscrew the air cylinder (4)
from the pump base (5). Carefully lift the air cylinder
off the air valve.
4.
Carefully remove the piston rod (10) from the pump
base (5) by pulling upward on the air valve (15).
5.
Remove the shaft seal (16*), wiper ring (11*), and
the gasket (9*) from the top of the motor base (5).
6.
Reach inside the opening of the air motor base (5)
to remove the o-ring (26*). Carefully remove the
wiper ring (11*) and the seal (12*) from the motor
base.
7.
Lubricate and install the new shaft seal (16*), upper
wiper ring (11*), gasket (9*), seal (12*), lower wiper
ring (11*), and o-ring (26*) into the base (5).
8.
For pumps 222051, 222103, or 222104
a.
Remove the washer (19c) and piston seal
(19b*) from the fluid piston (19a).
b.
Lubricate the new piston seal (19b*) and install
it on the fluid piston (19a).
c.
Install washer (19c) onto fluid piston (19a).
For pump 685438
a.
Remove the washer (19c), piston seal (19b),
and piston spacer (19d) from the fluid piston
b.
Remove the spacer o-ring (19e) from inside the
piston spacer (19d)
c.
Lubricate and install the new spacer o-ring
(19e) inside the piston spacer (19d)
d.
Carefully slide the piston spacer (19d) and
o-ring (19e) assembly onto the fluid piston
(19a).
e.
Lubricate the new piston seal (19b) and install it
on the fluid piston (19a).
f.
Install washer (19c) onto fluid piston (19a).
For all pumps
9.
Install the air motor rod assembly by inserting it
down through the pump base (5) from the top.
10. Carefully install air cylinder (4) onto the base (5),
making sure the gasket (9*) is in place. Screw the
cylinder and base together until hand tight.
11. Place the check ball (18) on the fluid piston (19)
12. Apply thread sealant to the threads of the fluid pis-
ton (19), screw the fluid piston onto the piston rod
(10), and tighten to proper torque. For 222051,
222103, and 222104 the proper torque is 23 ft-lbs
(31.2 N-m). For 685438, the proper torque is 50
ft-lbs (68 N-m).
13. Heavily lubricate the top inside diameter of the fluid
cylinder (24) and the outside threads. Carefully
guide the fluid piston assembly into the fluid cylin-
der. Push the fluid cylinder up, and screw it into the
pump base. Use strap wrench on the knurled part of
the intake valve housing (21) to tighten the fluid cyl-
inder and the intake valve to the pump base.
Do not cycle pump with any parts disassembled.
