JLG 660SJ Service Manual - Manual (Page 54)

SECTION 3 - CHASSIS & TURNTABLE
3-10 – JLG Lift – 3121298
Spindle - Brake Assembly
1. Place Spindle (1A) with flange side up.
2. Place Stator (8K) in Spindle (1A) scallop cuts.
3. Place Rotor (8J) on top of Stator (8K).
4. Repeat steps 2 & 3 until there are a total of 9 Stators (8K)
and 8 Rotors (8J) installed.
5. Place Piston (8A) with smaller O.D. end facing up. Grease
two O-Rings and two Backup Rings.
6. Install large Backup Ring (8E) in large-diameter groove at
bottom of Piston (8A).
7. Install large O-Ring (8D) in large-diameter groove at bot-
tom of Piston (8A), on top of large Backup Ring (8E).
8. Install small O-Ring (8F) in small-diameter groove near
top of Piston (8A). Make sure O-Ring is seated on the
bottom of the groove.
9. Install small Backup Ring (8H) in small-diameter groove
near top of Piston (8A), on top of small O-Ring (8F).
10. Insert Piston (8A) in Spindle (1A) until it contacts Stator
(8K).
11. Insert appropriate number of Springs (8L), based on
assembly print, into Piston (8A)counterbore.
12. Place Spring (1L) in Coupling (7) counterbore. Place Pres-
sure plate (1M) on top of Spring (1L).
13. Use appropriate tool to install Retaining Ring (1K) in
retaining ring groove in coupling (7) counterbore.
14. Insert Coupling subassembly (7) through Rotors (8J).
15. Place Pressure Plate (8B) on top of Springs (8L).
16. Use two ¼ -20 x 0.625 Flat Head Cap Screws (22) by bolt-
ing Pressure Plate (8B) and Piston (8A) together or some
other appropriate tools to install Retaining Ring on top
of Pressure Plate (8B) until Retaining Ring (8C) is seated.
NOTE: Remove two screws from units when done or brake will not
function.
17. Install Pipe Plug (21) if applicable.
Figure 3-11. Spindle-Brake Assembly
8C
8B
8L
8E
8A
8F