37
Repair Information
– Series 2 Variable Displacement Pump
The next step in zeroing in
the swashplate is to use a
3/8 in. end wrench to turn
the servo piston adjust-
ment screw clockwise or
counterclockwise to bring
the swashplate to the zero
position. NOTE Earlier
units used a screwdriver
slot to adjust the neutral position. (see Figure 88)
The final step is to hold
the servo adjustment
screw in the stationary
position. Use 3/4 in. end
wrench to tighten the
servo adjustment screw
lock nut, using caution not
to disturb the neutral or
zero swashplate position.
Torque the lock nut to 45 ft. lbs. [61 Nm]. (see Figure 89)
After removing the depth
micrometer and parallel
bar, install the two hollow
dowel pins in the pump
housing and the two hold-
down springs and wash-
ers on the swashplate
hold-down arms. (see
Figure 90)
Next install the two hold
down arm assembly
alignment tool and dow-
els. NOTE: This is a very
handy assembly tool,
please see the special tool
section located in the back
of this manual for the di-
mensions required to
make this special tool.
(see Figure 91)
Lubricate and install the
rear bearing shims and
cup into the pump end
cover. To check the shaft
end play, the pump end
cover must be installed
without either the valve
or bearing plates. This
will help to remove the
cylinder barrel spring tension against the input shaft. (see Fig-
ure 92)
Aligning the pump end cover
with the hold down arm assem-
bly alignment tool (2) dowels,
install the end cover. (see Fig-
ure 93)
After installation remove the four
dowel pins and carefully remove
the alignment tool (2) using cau-
tion as not to disturb the hous-
ing gasket. (see Figure 94)
If you do not have the special
alignment tool (2), the swash
plated hold-down ears and
springs still must be aligned
with the recesses machined into
the face of the end cover before
it can set squarely on the pump
housing. This can be done by
slightly elevating the end cover
and using a machinist ruler or similar tool to align the ears and springs
with the recess. This must be done on both sides of the end cover.
(see Figure 95)
Install four of the end cover re-
taining cap screws. Tighten cap
screws. (see Figure 96)
Reposition and support the
pump assembly on its end cover.
Use a hammer to gently tap the
input shaft inward. (see Figure
97)
Figure 88
Figure 89
Figure 90
Figure 91
Figure 92
Figure 93
Figure 94
Figure 95
Figure 96
Figure 97