9
Model 72400
centering the servo piston assembly is required. Measure in
from the left side and set servo piston 12,7 mm [.5 in.] from
surface of housing servo bore as shown in figure 1-5.
Note: Re-adjustment may be required for neutral at unit start-up.
;
12,7 mm
[.5 in.]
Adjust to center piston
Install servo piston
in this direction.
Figure 1-5
5
Install new seal washer, washer, and jam nut to servo
piston bolt. Holding servo piston bolt with hex key wrench
Torque jam nut 17 to 18 N•m [ 150 to 160 lbf•in]. Check the
centering of servo piston assembly. Install new cover plate
gasket and cover plate to left side of servo piston and retain with
four each washers and #10-24 cap screws. Torque cap screws
4,5 to 5,4 N•m [40 to 48 lbf•in.].
6
To assemble cradle sub-assembly, install bushing onto
cradle retaining with button head cap screws. Torque button
head cap screw 1,6 to 1,8 N•m [14 to 16 lbf•in.]
7
Place cradle sub-assembly into housing making sure cradle
is completely seated into housing. Retain cradle sub-assembly
with two cap screws. Torque cap screws 27 to 33 N•m [20 to 24
lbf•ft].
8
To install shaft, place exterior retaining ring, thrust race,
thrust bearing, second thrust race, and second retaining ring
onto shaft. Position washer and shaft seal or spacer onto shaft.
9
Install shaft assembly into front of housing for units with
spacer, retain with interior retaining ring and go on to step 10.
For units with shaft seal, seat seal into position with seal driver
and retain with interior retaining ring.
10 Install servo piston follower onto swashplate dowel pin.
Install swashplate carefully onto bushing (coat bushing surface
with hydraulic oil), aligning servo piston follower with slot in
servo piston assembly.
Disassembly and Reassembly
Housing Inspection:
• Check the bearing (press fit) in housing. If needles
remain in cage, move freely, and setting at the dimension
shown in figure 1-4, removal not required.
1,78 mm
[.07 in.]
Numbered End
Flange End of Housing
Figure 1-4
16 To remove cradle sub-assembly, remove the two cap
screws retaining cradle inside housing. Removing cradle sub-
assembly from housing.
17 Remove button head cap screws (qty. 2) to remove
bushing from cradle.
Bushing Inspection:
• Inspect bushing for contamination embedment within
coating of bushing surface coming in contact with swashplate.
18 Remove all plugs from housing.
19 Discard the shaft seal, gaskets, and o-rings from all
assemblies. Replace with new seals upon reassembly.
Reassembly -
Servo Controlled Piston Pump
1
All parts should be cleaned and critical moving parts
lubricated before reassembly.
2
If necessary, press new bearing in housing to dimension
shown in figure 1-4 with the numbered end of bearing outward.
3
Install the two new seal sub-assemblies into the servo
piston cavity of housing.
4
Screw the cover plate onto the servo piston assembly.
Install new cover plate gasket in place on housing. Install servo
piston assembly and cover plate into servo piston bore in right
side of housing (as shown in figure 1-1 and figure 1-5). Retain
cover plate with four each washers and cap screws. Torque cap
screws 4.5 to 5.4 N•m [40 to 48 lbf•in.]. To obtain neutral,
Front Flange - Drive Shaft End of Pump
Right Side
Left Side
