Swing Motor Installation - JLG 400S Service And Maintenance Manual

NOTE: Refer to the figure below for installing O-Rings (8D), (8F)
and Back up Rings (8E), (8H).
6. Lightly grease cylinder walls of Brake Housing (6) and
install Brake Piston (8A) into Brake Housing (6). If neces-
sary, place T-134711 on top of brake and lightly tap until
Brake Piston (8A) contacts brake disk stack.
7. Insert 8 Springs (8L) into Brake Piston (8A) spring holes.
8. Install Pressure Plate (8M) into Brake Housing (6) bore
and onto top of Springs (8L).
9. Insert and tighten the 0.250-20 UNC Flat Head Cap
Screws through the Pressure Plate (8M) and into the
Brake Piston (8A) to compress the springs. Tighten
Socket Head Cap Screws incrementally to evenly com-
press the Springs (8L)
SAFETY GLASSES MUST BE WORN DURING THESE NEXT STEPS.
10. Using retaining ring pliers, install large Retaining Ring
(8N) into groove in Brake Housing (6) making sure that it
is seated properly.
NOTE: Use caution when installing retaining ring (8N) into Brake
Housing (6). It may cause injury if it slips out of retaining
ring pliers.
11. Remove the Flat Head Cap Screws from the Brake Piston
(8A) incrementally to release the tension of the springs
slowly. Discard Flat Head Cap Screws.
12. The Unit should undergo brake test (as per instructions
in this section).
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SECTION 3 - CHASSIS & TURNTABLE
13. Grease and install the O-Ring (26) into the Motor (31)
pilot.
14. Install Motor (31) into the Brake Housing (6). Insure the
motor valve mounting face is aligned with the radial
brake release port in the Housing (1G).
Figure 3-47. Swing Motor Installation
15. Install Bolts (29) into Brake Housing (6) through Lifting
Lugs (28) and Motor (31) flange. Torque bolts to
80-100 ft. lbs. (108.5-135.5 Nm).
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