JLG 600SC_660SJC Service Manual - Manual (Page 52)

SECTION 3 - CHASSIS & TURNTABLE
3-16 – JLG Lift – 3121607
Disassembly
PREPARATION
1. Drain all oil before removing motor.
2. Clean outside of motor and Cover oil ports to prevent
contamination.
3. Warm parts during disassembly to prevent damage.
BASE PLATE
1. Place drive assembly with piston motor side up. Loosen
Socket Head Bolts evenly. Remove Flange, Spring Seat,
Spring, and Spring Seat.
2. Turn and pull Plunger Assembly out. If difficulty is
encountered, tap end of Plunger and insert it. Be sure
Plunger slides smoothly and then try again. Do not dis-
assemble Plunger Assembly.
3. Loosen Plug and Remove Relief Valve Assembly.
DO NOT LOOSEN NUT AND SET SCREW. SETTING PRESSURE IS CHANGED BY
LOOSENING NUT AND SET SCREW.
4. Remove Poppet Seat from Base Plate.
5. Remove Plugs and Spring. Turn and pull Spool out. If dif-
ficulty is encountered, tap end of Spool and insert it. Be
sure Spool slides smoothly, then try again.
NOTE: Do not loosen Plugs and Orifices if it is not necessary.
6. Loosen Socket Head Bolts evenly and pull assembly off
Case and Base Plate out of Flange. If difficulty is encoun-
tered, tap top of Base Plate and insert it, then try again.
7. Position Case and Base Plate Assembly with shaft down.
Loosen Socket Head Bolts evenly and remove Base Plate.
8. Remove Valve Plate, Springs, O-Ring and Pin. Do not
damage Valve Plate.
BRAKE PISTON
1. Blow compressed air in brake oil passage to remove
Brake Piston from Case. Brake Piston may be ejected out.
2. Remove O-Rings from Brake Piston. Remove three Disk
Plates and two Friction Plates.
CYLINDER BLOCK
1. Pull out Cylinder Block Assembly by holding Retainer
Plate and Cylinder Block. Do not damage Piston Shoe
and Cylinder Block.
2. Mark Piston Assembly and Cylinder Block to identify
each position. Remove Piston Assembly and Retainer
Plate from Cylinder Block.
3. Remove Retainer Holder and Pins.
4. Compress Spring and remove Snap Ring. Remove Collar
and Spring from Cylinder Block.
5. Remove Swash Plate.
6. Remove Spring from Flange. Steel Balls may come off
with Swash Plate.
7. Remove Shaft, Ball Bearing, and Oil Seal.
GEAR BOX
1. Remove Plugs and drain oil.
2. Remove Socket Head Bolts from Cover. Tap Cover with
plastic hammer to break seal and remove Cover.
3. Remove Thrust Plate.
4. Remove Drive Gear and Holder A S/A.
5. Remove Thrust Plate and Sun Gear B.
6. Remove Holder B S/A and Sun Gear C.
7. Loosen Socket Head Bolts evenly and remove Ring Gear.
Pins may stick.
8. Loosen Socket Head Bolts and remove Plate. Using a
press, remove Holder C S/A with the caution not to have
the Pins stick.
9. Remove Shim.
10. Remove Coupling.
11. Press Flange out of Housing.
12. Remove Floating Seal from Housing with a flat-tip screw-
driver.
13. Press Angular Bearings out of Housing.
14. Using flat-tip screwdriver and remove another Floating
Seal from Flange.
15. Wash parts with cleaning solvent. Apply rust preventa-
tive if parts are stored before reassembly.