SECTION 3 - CHASSIS & TURNTABLE
3-32
3121160
3.9
DRIVE MOTOR (SN 0300138447 THROUGH
0300185827)
Description
The drive motors are low to medium power, two-position axial
piston motors incorporating an integral servo piston. They are
designed for operation in both open and closed circuit appli-
cations. The standard control is a direct acting single line
hydraulic control. The integral servo piston controls motor dis-
placement.
The motors are spring biased to maximum displacement and
hydraulically sh.ifted to minimum displacement. Minimum
and maximum displacement can be set with fixed internal
stops. The large diameter servo piston allows smooth accelera-
tion and deceleration with relatively large circuit orificing.
Shaft Seal Replacement
REMOVAL
1.
Remove the snap ring (1) retaining the shaft seal and
support washer.
2.
Remove the support washer (2).
3.
Carefully pry out the shaft seal (3).
To avoid damaging the shaft during removal, install a
large sheet metal screw into the chuck of a slide ham-
mer. Drive the screw into the seal surface and use the
slide hammer to pull the seal.
4.
Discard the seal.
INSPECT THE COMPONENTS
Inspect the new seal, the motor housing seal bore, and the
sealing area on the shaft for rust, wear, and contamination.
Polish the shaft and clean the housing if necessary.
INSTALLATION
1.
Cover the shaft splines with an installation sleeve to pro-
tect the shaft seal during installation.
2.
Install a new shaft seal with the cupped side facing the
motor. Press seal into housing until it bottoms out. Press
evenly to avoid binding and damaging the seal.
3.
Install seal support washer.
4.
Install snap ring.
5.
Remove the installation sleeve.
Bias spring
Servo piston
Swashplate
Output
Shaft
Piston
Slipper
Cylinder
Block
Endcap
Shaft
Seal
Bearing
Minimum
Angle
Stop
Valve plate
Figure 3-14. Drive Motor Cross Section
1
2
3
1.
Snap Ring
2.
Support Washer
3.
Shaft Seal
Figure 3-15. Removing the Shaft Seal
Summary of Contents for 740AJ
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Page 303: ...SECTION 4 BOOM PLATFORM 3121160 4 31 Figure 4 20 Rotator Assembly HELAC...
Page 460: ...SECTION 5 BASIC HYDRAULIC INFORMATION AND SCHEMATICS 5 116 3121160 NOTES...
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