Motor Control Valve Installation - JLG 400SC Service And Maintenance Manual

Motor Control Valve Installation

NOTE: Verify o-rings are located in between the motor and valve.
1. Install O-Rings (99) into counterbore on Motor Valve
face.
2. Install Motor Control Valve (32) on Motor (31) using Bolts
(21) and Washers (22). Torque Bolts to 18-20 ft-lb
(24.5-27 Nm). Ensure holes in Motor Control Valve (32)
are aligned with holes in Motor (31).
3. Install Elbow Fitting (30) into Brake Housing (6). Ensure
the thread fitting O-ring seats onto the Brake Housing
(6). Rotate the Elbow Fitting (30) to horizontal position
as shown in picture.
4. Install Elbow Fitting (30) into Motor Valve (32). Ensure
the thread fitting O-ring seats onto the Motor Valve (32).
Rotate the Elbow Fitting (30) to horizontal position as
shown in picture.
5. Install Tube Assembly (35) to elbow fittings as shown in
picture. Torque tube assembly nut to 13-15 ft-lb
(17.5- 20 Nm). Tighten Jam Nut on Elbow Fitting (30)
into 13-15 ft-lb (17.5- 20 Nm). torque.
31215019
Figure 3-37. Motor and Brake Assembly
10. Install O-ring plug (23) onto motor control valve (32).
SECTION 3 - CHASSIS & TURNTABLE
6. Install one O-Ring Plug (23) onto Motor Control Valve
(32). Torque to 18-20 ft-lb (24.5-27 Nm).
7. Install hydraulic test fitting into the other control valve
O-ring Plug (23) hydraulic port.
8. Perform pressure decay test at "MAXIMUM PRESSURE".
Hold pressure for 1 minute. If pressure does decay,
remove the pressure and inspect connections and
retest.
9. Remove hydraulic test fitting.
Torque to 18-20 ft-lb (24.5-27 Nm).
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