Removing
and Installing the Pump
WARNING
To
reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 6.
Removing the pump. (See Fig. 36)
1. Flush
the pump.
Relieve the pressure
.
2. Remove the spring clips (100,102) and drain hose
(101).Hold
t
h
e i
ntak
e v
alv
e (
423
) w
it
h a w
renc
h a
nd
u
n-
screw
t
h
e s
uctio
n t
ube (30)
. R
emov
e t
h
e h
ose (59).
3.
Push the retaining spring (26) up. Push the pin (25)
out the rear
.
4. Loosen
the locknut (27). Unscrew the pump. See be
-
low
for how to repair the pump.
0477
59
26
25
27
100
101
102
30
Fig. 36
Installing the pump. (See Fig. 37)
1. Screw
the
pump about 3/4 of the way into the bearing
housing
(21). Hold the pin (25) up to the pin hole on
the
connecting rod (22) and continue screwing in
the
pump
until the pin slides easily into the hole.
2.
Back of
f the pump until the top threads of the pump
cylinder
are flush with the
face of the bearing housing
and
the outlet nipple faces back.
3. Push
the retaining spring (26)
into the groove all the
way around the connecting rod. Tighten the locknut
(27)
to 97 N.m using a 2–1/4 in. open end wrench and
a
light hammer
.
4. Install
the
front cover and screws. Connect the pump
outlet
hose. Install the suction tube parts. Install the
spring clips and drain hose.
0031
21
26
22
FACE
OF
BEARING
HOUSING
25
27
TORQUE TO
97 N.m
Fig.
37
Displacement
Pump
WARNING
To
reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 6.
Disassembly
1. Relieve the pressure. Remove the pump from the
sprayer.
See page above.
2.
Disassemble the intake valve. See Fig. 38.
3. Clean and inspect the parts. Replace any worn or
damaged parts. Use a new o–ring (401* ). If no fur-
ther
service is needed, reassemble the intake
valve
and
torque it into the cylinder to 146 N.m.
*401
421*
423
419
420
*404
TORQUE
T
O
146 N.m
Fig.
38
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