16
308302
Service
Disassembly (See Fig. 4)
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 10.
NOTE: Repair Kit 223895 is available to repair the air
motor. Parts included in the kit are marked with an
asterisk, for example (103a*). For the best results, use
all the new parts in the kit.
NOTE: Repair Kit 223894 is available to repair the fluid
pump. Parts included in the kit are marked with a
dagger, for example (114†). For the best results, use
all the new parts in the kit.
1.
Relieve the pressure. Disconnect all hoses.
Remove the wiper plate. Remove the fluid outlet
elbow (28), noting its position relative to the air
inlet. Remove only the three screws (138) and
lockwashers (141) holding the pump to the mount-
ing bracket (33).
2.
Rotate the pump so the bleeder valve (25) is
aligned with the slot in the mounting bracket (33),
and lift the pump straight up through the bracket.
NOTE: Preform step 3 only if the air valve (165) needs
replacement. Otherwise, proceed to step 4.
3.
If it is necessary to replace the air valve (165)
unscrew the cylinder cap (101) from the air motor
cylinder (102). Unscrew the two socket screws
holding the air valve (212). Remove the air valve.
CAUTION
Do not immerse the air valve (165) in solvent. To
clean the valve, use a brush and compressed air.
4.
Remove the three remaining screws (138) and
washers (141) holding the air motor coupling (105)
to the cylinder (102). Pull the cylinder straight up
off the coupling until the air valve housing (103a)
clears the air motor piston (104).
5.
Unscrew the air valve housing (103a) from the
cylinder (102).
6.
Remove the pin (144) from the air motor piston
(104) and the fluid piston (106). Unscrew the air
motor piston from the fluid piston, and pull it
straight up out of the air motor coupling (105).
Remove the large o-ring (103d) from the outer
diameter of the air motor piston, and the two small
o-rings (103b) from the inner diameter.
7.
Unscrew the air motor coupling (105) from the
cylinder coupling (196). Pull the air motor coupling
straight up until it clears the fluid piston (106).
Remove the o-ring (103c, 103e) from the coupling.
8.
Hold the fluid piston (106) steady by inserting a
small screwdriver or punch into the 4 mm diameter
hole (A). Remove the screw (145) and lockwasher
(135) holding the priming piston (115) to the prim-
ing piston rod (110).
9.
Pull the priming piston rod (110) and fluid piston
(106) straight up out of the fluid housing (109).
Remove the pin (123), and unscrew the priming
piston rod from the fluid piston.
10. Unscrew the intake valve housing (111) from the
fluid housing (109). Remove the o-ring (161) from
the intake valve housing.
11. Remove the intake valve (114) and valve stop
(112) from the intake valve housing (111).
12. Unscrew the wet-cup/packing nut (107). Remove
the u-cup packing (163) from the throat. Remove
the o-ring (162) from the wet-cup/packing nut.
13. Clean all parts with a solvent compatible with the
fluid you are pumping, and inspect for wear or
damage. Reassemble as explained on page 18.
