JLG 660SJ Service Manual - Manual (Page 63)

SECTION 3 - CHASSIS & TURNTABLE
3121202 – JLG Lift – 3-13
9. Install small Backup Ring (8H) in the small-diameter
groove near the top of the Piston (8A), on top of the
small O-Ring (8F).
10. Insert Piston (8A) into Spindle (1A) until it contacts
the Stator (8K).
11. Insert the appropriate number of Springs (8L),
based on the assembly print, into Piston (8A)coun-
terbore.
12. Place Spring (1L) into Coupling (7) counterbore.
Place the Pressure plate (1M) on top of Spring (1L).
13. Use appropriate tool to install Retaining Ring (1K)
into the retaining ring groove in the coupling (7)
counterbore.
14. Insert Coupling sub-Assembly (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
bolting the 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 2 Screws from units when done, otherwise
brake will not function.
17. Install Pipe Plug (21) if applicable
Hub-Spindle Sub-Assembly
NOTE: Spray a light film of oil on all component parts during
assembly. Spray a generous amount of oil on bear-
ings during installation.
1. Press Bearing Cup of part (1C), position "A", into
Hub using T-158422 pressing tool.
2. Turn hub over and press Bearing Cup of part (1C),
position "B", into hub using T-158422 pressing
tool.(T).
3. Place Bearing Cone of part (1C), into Bearing Cup of
part (1C), position "B".
4. Grease Seal (1B) lip and press seal into Hub (1D)
using appropriate tool until seal is flush with end of
hub.(T).
5. Place Hub (1D) into pressing base. Press nine Studs
(1H) into Hub.
NOTE: Use enough pressure to press in studs. Don t use
excessively high pressure to press in studs or hub
may crack.
6. Set Spindle assembly (1A) on the bench with the
flange down. Turn Hub (1D) over and lower onto
Spindle (5). Install boot (21) if applicable.
7. Install Bearing Cone of part (1C) into Bearing Cup,
position "A".
8. Apply Loctite 243 on Bearing Nut (1F) thread. Screw
Nut (1F) on top of Bearing Cone of part (1C). Leave
0.003-0.005 inches end play to check the initial roll-
ing torque with the unit tied down. Then torque Bear-
ing Nut (1F) until rolling torque is 40 to 50 in-lbs
greater than initial rolling torque. Using tool T-
206569 for the Bearing Nut.
NOTE: Final torque is initial rolling torque plus 40-50 in-lbs.
E.g., if the initial rolling torque is 30 in-lbs, the final
rolling torque is between 70-80 in-lbs. Be sure to
rotate hub as the torque is applied to properly seat
the bearing. Be sure the torque wrench is tangent to
the Hub (1D) OD.
9. Using appropriate tool, install two Set Screws (1G)
into Bearing Nut (1F) threaded holes. Make sure Set
Screw is driven into the spindle thread. Tighten the
set screws to damage the thread and stake the edge
of the nut around the Set Screws (1G) so the nut will
not loosen.
10. Place Thrust Washer (4H) into counterbore of Spin-
dle (1A).
11. Place Planet Gear Sub-assembly (4) into Spindle
(1A) through gap between two Studs (1H). Align the
planet gear bore with one of the planet shaft holes
on the spindle (1A) assembly using T-209919.
12. Insert a Planet Shaft (4E) into the planet shaft hole
described in Step (11) on Spindle (1A). The end of
the planet shaft that does NOT have the roll pin hole
should be inserted into the Spindle FIRST.
13. Now insert Planet Shaft (4E) through the first set of
Thrust Washers (4B), Planet gear, then the second
set of Washers (4B). Use an alignment punch or sim-
ilar tool to align roll pin holes on Spindle (1A) and
Planet Shaft (4E).
NOTE: Be sure not to hit the Planet Gears (4F) when driving
in Roll Pins (4G).
14. Drive Roll Pin (4G) down into the aligned roll pin
holes. Pin should be flush with OD of spindle.
15. Repeat Steps (11-14) for the installation of the two
remaining Planet Gears (4F).