JLG 660SJ Service Manual - Manual (Page 51)

SECTION 3 - CHASSIS & TURNTABLE
3121298 – JLG Lift – 3-7
Spindle-Brake Disassembly
NOTE: Units with integral Input Brake (8) only.
COMPRESSED SPRINGS CAN FLY OUT AND CAUSE SEVERE EYE DAMAGE OR
OTHER INJURIES. WEAR EYE PROTECTION WHEN PERFORMING THESE PROCE-
DURES.
1. Install two 1/4"-20 x 5/8" Flat Head Cap Screws (22)
through Pressure Plate (8B) into Piston (8A). Tighten
incrementally until spring force is taken off Retaining
Ring (8C).
NOTE: Flat Head Cap Screws (22) are for transit and service only
and are removed before shipping new units. They are
included in most brake repair kits.
2. Using retaining ring pliers, remove Retaining Ring (8C)
from groove in Spindle (1A).
3. Back Flat Head Cap Screws (22) incrementally out of Pis-
ton (8A) until spring force is relieved from Pressure Plate
(8B). Remove Flat Head Cap Screws (22) and Pressure
Plate (8B) from brake cavity in Spindle (1A).
4. Remove Compression Springs (8L) from Piston (8A).
5. Using an air hose, slowly and carefully pressurize brake
port in Spindle (1A) until Piston (8A) comes out of piston
bore of Spindle (1A). Pull Piston (8A) out of Spindle (1A)
by hand.
6. Remove Backup Rings (8E and 8H) and O-rings (8D and
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 cavity in
Spindle (1A).
9. Remove Retaining Ring (1K) from internal groove using
appropriate tool.
10. Remove Spacer (1M) and Spring (1L) from bore of Cou-
pling (7).
11. Remove Plastic Plug (12) and Pipe Plug (21) from Spindle
(1A) if applicable.
Figure 3-8. Spindle Brake Disassembly
8C
8B
8L
8E
8A
8F