Drive Motor (Sauer); Description; Shaft Seal Replacement; Drive Motor Cross Section - JLG 3394RT Service And Maintenance Manual

5. Install the drive motor on the hub, then release the
hydraulic pressure at the brake release port. The cou-
pling will remain in position.
Disconnect the hydraulic power supply and reconnect the line
going into the brake release port.
3.4

DRIVE MOTOR (SAUER)

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 shifted to minimum displacement. Minimum and
maximum displacement can be set with fixed internal stops.
The large diameter servo piston allows smooth acceleration
and deceleration with relatively large circuit orificing.
Bias spring
Minimum
Angle
Stop
Cylinder
Block
Piston
Endcap
Valve plate
Figure 3-5. Drive Motor Cross Section
3121642

Servo piston

Swashplate
Output
Shaft
Shaft
Seal
Bearing
Slipper
SECTION 3 - CHASSIS, PLATFORM & SCISSOR ARMS

Shaft Seal Replacement

REMOVAL
1. Remove the snap ring (1) retaining the shaft seal and
support washer.
Figure 3-6. Removing the Shaft Seal
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.
– JLG Lift –
1
2
3
1. Snap Ring
2. Support Washer
3. Shaft Seal
3-21