Motor And Brake Assembly; Motor Control Valve Assembly - JLG 660SJ Service And Maintenance Manual

Motor and Brake Assembly

1. Insert Stator (8K) (O.D. lobes) in bore of Brake Housing
(6). Alternate Rotors (8J) (I.D. splines) and Stators, ending
with a Stator (8K).
2. Grease O-rings (8F) & (8D) and Back-up rings (8H) & (8E).
Place them in their respective grooves in Brake Housing
(6) and Piston (8A). Make sure Back-up rings are correctly
positioned.
3. Apply grease sparingly to Piston O.D. (8A) and bore of
Brake Housing (6). Insert Piston (8A) in Brake Housing
(6). Do not damage O-rings.
4. Install Springs (8L) in Piston (8A) spring pockets.
5. Test brake and perform roll test. Remove Brake Test
Plate.
6. Install O-ring (26) on pilot of Motor (31). Use grease to
keep O-ring in place.
7. Place Motor (31) in Brake pilot and line up holes. Check
timing sheet.
8. Assemble Lift Lugs (28) on Hex Bolts (29). Assemble Hex
Bolts (29) with Lift Lugs (28) through Motor (31) and
Brake (6) against Motor flange. Torque to 80-100 ft-lb
(108-135 Nm).
8D
8A
8E 8L
26
Figure 3-59. Motor and Brake Assembly
3121298
6
8K
8K
8J 8K
8K
8J
8J
8J
Brake Port
8F
28
29
31

Motor Control Valve Assembly

1. Lay assembly down with motor ports facing up. Remove
two plastic plugs in the motor ports. Do not to lose O-
ring in each port. Assemble Motor control Valve (32) on
Motor (31) with Bolt (21) and Lock Washers (22). Torque
Bolts (21) to 23-27 ft-lb (31-36 Nm).
NOTE: Align holes in control valve with motor ports.
2. Install Elbow Fittings (30) in Brake (6). Do not tighten
jam nuts.
3. Install Elbow Fittings (30) in Motor Control Valve (32). Do
not tighten jam nuts.
4. Assemble Tube (35) in Elbow Fittings (30). Torque jam
nuts to 13-15 ft-lb (17-20 Nm).
5. Install one O-ring Plug (23) in Motor Control Valve (32).
Torque to 30-31 ft-lb (40-42 Nm).
6. Pressure test brake, tube, and control valve connections
by applying 3000 psi (207 bar) pressure to open port in
Motor Control Valve (32) and holding for one minute.
Check for leaks at control-valve-motor interface and
tube connections. Release pressure and install remain-
ing O-ring Plug (23) in Motor Control Valve (32). Torque
to 30-31 ft-lb (40-42 Nm).
31
6
8K
8H
1P
Figure 3-60. Motor Control Valve Assembly
– JLG Lift –
SECTION 3 - CHASSIS & TURNTABLE
O-Ring
32
23
22
21
3-43