JLG 150HAX Service Manual - Manual (Page 67)

SECTION 3 - CHASSIS & TURNTABLE
3120817 – JLG Lift – 3-29
16. Place twenty lockwashers (24) over bolt holes in
cover.
17. Place twenty bolts (31) into bolt holes in cover and
tighten.
18. Torque bolts to 35-45 ft. lb. (47-61 Nm).
19. Apply a light coat of “Never-Seize” to three pipe
plugs (32) and tighten pipe plugs into holes in cover.
20. Place roll tester in coupling in end of unit and roll it in
both clockwise and counterclockwise directions.
Perform the same number of turns in each direction
as the ratio of the unit. This number is the same as
the last two digits in the model number found on the
ID tag of the unit.
21. Leak test unit at 5 psi (2 bar).
22. Remove pipe plugs (12) from hub and fill drive hub
half full with EP 90 extreme pressure lubricant, then
install pipe plugs in hub. Torque hub is half full when
lubricant runs out of side hole on hub.
3.8 SWING BRAKE - AUSCO - MACHINES
BUILT TO 1992
Disassembly
1. With shaft protruding downward, remove bolts (22)
alternately and evenly to reduce spring tension.
2. Remove power plate (21) and gasket (2).
3. Bearing (18) is pressed onto shaft (7) and must be
removed before removal of rotating discs (11) and
stationary discs (12).
4. Further disassembly is not recommended unless
necessary for the replacement of specific parts.
5. If further disassembly is required, remove shaft (7)
and stack sub-assembly from housing (1) by lightly
tapping or pressing on the small external spline end
of the shaft and removing the shaft, bearings and
stack from housing.
6. Remove bearing (18), stationary disc (12), rotating
disc (11), springs (10) and primary disc 9.
7. Remove bearing (3) from shaft, taking care not to
damage seal 4. Remove seal.
8. Remove springs (6) and spring retainer (5) from
housing.
9. Remove piston (13) from power plate by introducing
low pressure air (15 psi [10 bar]) into the hydraulic
inlet. Direct piston away from operator.
10. Remove o-rings (15 and 17) and back-up rings (14
and 16) from piston OD and ID grooves. Back-up
rings will be damaged and should not be removed if
replacement is not planned.
11. Pressure relief valve (23) can be removed and
inspected to assure spring loaded ball moves freely
and is contamination free.
Cleaning and Inspection
1. Clean all parts thoroughly.
2. Closely inspect all parts for damage, excessive wear,
cracks and chips. Replace parts as necessary.
3. Discard seals and o-rings.
4. Closely inspect bearings and bearing contact sur-
faces.
NOTE: Bearings may be re-used if, after thorough inspec-
tion, they are found to be in good condition.
Assembly
NOTE: Lubricate all seals, o-rings, cylinder of the power
plate and piston with clean hydraulic oil prior to
assembly.
1. Assemble piston (13) into power plate (21) using a
shop press, being careful not to damage the o-rings
or back-up rings. Visually align the center of the cut-
outs in piston with torque pin (8) holes in power
plate. Avoid pushing the piston all the way to the
bottom of the cylinder in the power plate. Try to keep
the top surface of the piston flush to 1/8 in. (3.2 mm)
below the machined surface of the power plate.
2. When pressing the bearing onto the shaft, press on
the inner race of the bearing and support the shaft
properly.
3. Rotating discs must be clean and dry. Worn or
heavily scored discs must be replaced.
4. Press bearing (3) into housing 1. Bearing must be
seated against shoulder in housing.