17
G25-991-2400A
H/G-25 Service (Hydraulic End)
g. Alternately tighten the nuts (31) to evenly draw the
housing down to the cylinder housing. Be sure the O-ring
(65) stays in place.
Also, as you tighten the nuts keep checking the shaft
alignment by turning the shaft (use the rotator in the
Wanner Tool Kit). If the shaft begins to bind and become
difficult to turn, back off the nuts and realign the shaft.
When the pump housing is tight against the cylinder
housing, you should be able to turn the shaft smoothly.
h. After all the nuts (31) are tightened, insert cap screws
(26), with washers (6), into the two unused threaded
holes in the housing. Then remove the two threaded
studs and replace them with the other two cap screws
and washers.
i. Turn the shaft again to check its alignment.
5. Replace Shaft Seals
a. Apply a thin film of grease on the seal protector tool (part
of the Wanner Tool Kit). Slide both seals onto the tool,
with the spring side of the seals toward the open end of
the tool.
Apply a heavier coat of grease between the seals and
press them together.
b. Apply a coating of Loctite® High-Performance Pipe
Sealant With PTFE, or a comparable product, to the
outer surface of both seals and the inside surface of the
opening in the pump housing where the seals will rest.
c. Apply a light film of grease to the drive shaft. Slide the
seal protector tool (with the two seals) over the end of
the shaft.
d. Slide the seal inserter tool (from the Wanner Tool Kit) over
the seal protector tool, and press the seals completely
into place. Tap the tool with a soft mallet to firmly seat
the seals.
6. Adjust Camshaft Endplay
a. If the three set screws (24) are in the cylinder housing
(25), remove and clean them.
b. Insert the centerbolt (1) into the hole in the center of the
cylinder housing. Turn it in to move the bearing adjusting
plate (61) and cup tight against the bearing cone.
c. Back out the centerbolt
two full turns, then turn it back
in again until it is tight against the adjusting plate (61).
d. Back out the centerbolt
exactly 1/4 of a turn.
e. With a plastic mallet (or a regular mallet and wooden
board) to prevent damage to the shaft, rap the end of the
shaft three or four times. This will provide about 0.006
in. (0.15 mm) endplay in the shaft.
f. Apply removable threadlocker to the threads of the three
cleaned set screws (24).
Screw the three set screws (24) into the cylinder housing
until they contact the bearing adjusting plate (61).
g. Remove the centerbolt (1).
7. Install Plungers
NOTE: If the plungers (23) have been removed from the
valve plungers (54), do not reuse them. Install new ones
instead.
a. Rotate the pump shaft so the piston is in the top-dead-
center position.
b. Place a plunger on the exposed screw end of the plunger
guide tool from the Wanner Tool Kit. The larger-diameter
side of the plunger should face the tool.
c. Screw the guide (with the plunger) into the valve plunger
(54) until tight.
d. Hold the single bottom handle of the guide, and turn the
double top handle to force the plunger to seat on the
valve plunger. This is a press-fit — when installed, the
plunger should be tight against the shoulder of the valve
plunger.
NOTE: Do not remove the plunger guide until the
diaphragm is installed (see below).
e. Install the diaphragm as outlined below, then repeat the
procedure for the other two plungers and diaphragms.
8. Reinstall Diaphragms
a. With the plunger guide tool still screwed into the valve
plunger (54), pull the valve plunger up until the cross-
holes in the valve plunger are exposed.
b. Insert the plunger holder (from the Wanner Tool Kit),
through the top hole — to hold the plunger (23) away
from the cylinder housing, and to keep the valve plunger
from turning when the diaphragm is being installed.
c. Place the diaphragm (22) onto the plunger (23), ridge-
side out.
d. Center the diaphragm follower (21) on the diaphragm.
e. Place the O-ring (20) onto the follower screw (19).
f. Apply a small amount of threadlocker to the threads of
the follower screw.
g. Insert the follower screw (with O-ring) through the
diaphragm follower (21) and diaphragm (22), and screw
it into the valve plunger (54).
h. Hold the plunger holder, and torque the follower screw
to 18 in.-lbs (2.0 N-m).
i. Repeat the above procedure for the plungers and
diaphragms of the other two cylinders.
j. Fill the reservoir with fresh oil and prime the pump, as
outlined in the Fluid-End Service Section.
9. Reassemble Pump Head
Reassemble the pump head as outlined in the Fluid-End
Service Section.
To Next Page
Loading...
