JLG 660SJ Service Manual - Manual (Page 60)

SECTION 3 - CHASSIS & TURNTABLE
3-10 – JLG Lift – 3121202
NOTE: This procedure applies only to units with integral
Input Brake (8).
EYE PROTECTION MUST BE WORN WHILE PERFORMING THE
STEPS 1-3 IN THIS PROCEDURE.
1. Compress the Compression Springs (8L) by install-
ing two 1/4-20 x 5/8” Flat Head Cap Screws (22)
through Pressure Plate (8B) and into Piston (8A) and
tightening incrementally until spring force has been
taken off of the Retaining Ring (8C).
NOTE: Flat Head Cap Screws (22) are removed prior to
shipping new units since they are for transit and ser-
vice only. They are included in most brake repair kits.
2. Using retaining ring pliers, remove Retaining Ring
(8C) from the groove in the Spindle (1A).
3. Back Flat Head Cap Screws (22) incrementally out
of Piston (8A) until spring force is relieved from the
Pressure Plate (8B). Then, remove Flat Head Cap
Screws (22) and Pressure Plate (8B) from brake cav-
ity in Spindle (1A).
4. Remove Compression Springs (8L) from Piston (8A).
EYE PROTECTION MUST BE WORN WHILE PERFORMING THE
NEXT STEP IN THIS PROCEDURE.
5. Using an air hose, slowly and carefully pressurize
the brake port in the Spindle (1A) until the Piston
(8A) comes out of piston bore of Spindle (1A), Then
pull the Piston (8A) the rest of the way out of the
Spindle (1A) by hand.
6. Remove Backup Rings (8E) & (8H) and O-rings (8D)
& (8F) from grooves in Piston (8A).
7. Remove Rotors (8J) and Stators (8K) from brake
cavity in Spindle (1A).
8. Remove Coupling Subassembly (7) from brake cav-
ity in Spindle (1A).
9. Remove Retaining Ring (1K) out of the internal
groove using appropriate tool.
10. Remove the Spacer (1M) & Spring (1L) out of the
bore of Coupling (7).
11. Remove Plastic Plug (12) & Pipe Plug (21) from
Spindle (1A) if applicable.
1K. Retaining Ring
1L. Spring
1M. Spacer
7. Coupling
Figure 3-8. Coupling Subassembly