Oshkosh JLG 1500SJ, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-76 – JLG Lift – 3121262
Installation
Position 1-off gasket (5) over male pilot on brake housing (4).
Locate brake shaft (1) and secure brake in position using 2-off
1/2” UNC mounting bolts in the through mounting (fixing)
holes provided.
Connect hydraulic pressure supply to brake pressure inlet
port. Ensure that the hydraulic pressure is set to the required
level up to a maximum of 3000 psi (200 bar) and check that the
brake disengages and re-engages correctly.
Maintenance
The brake is required to be kept in good working order and
must be included in the planned maintenance program for the
equipment to which the brake is installed.
This must include torque testing together with inspection and
replacement of the working parts such as friction plates (3 & 6)
and, springs (22 & 23). The frequency of inspection depends
on the duty demanded of the brake.
Disassembly
To remove brake from its installed position, reverse procedure
previously described in the installation instructions.
Place the complete brake assembly on a clean, dry work
bench.
Remove external gasket (5) as necessary.
NOTE: Refer to Diagrams for the following.
1. Supporting brake face “A”, remove the six socket head
cap screws and washers (items 13 & 14) in equal incre-
ments to ensure the spring pressure within the brake is
reduced gradually and evenly.
Alternatively, if press is available, the cylinder housing
(8) can be restrained on face “B” while removing the six
socket head cap screws and washers (13 & 14).
The brake assembly can now be fully dismantled and
parts examined.
2. Remove cylinder housing (8) and piston (9) subassembly
and dismantle if required, removing O-ring seals (15 &
17) and backing rings (16 & 18) as necessary.
3. Remove gasket (7) from housing (2).
4. Remove friction plates (3 & 6) and pressure plate (4).
5. Remove 2-off dowel pins (19).
6. Remove springs (8). Take note of quantity and orien-
tation of springs.
7. Should it be necessary to replace ball bearing (10)
or shaft seal (12), reverse remainder of brake sub-
assembly, supporting on face “c” of housing (2).
8. Remove internal retaining ring (11).
9. Using arbor press or similar to break Loctite seal,
remove brake shaft (1) from housing (2) and lay
aside.
10. Reverse housing (2) and press out ball bearing (10).
Shaft seal (12) can also be removed if necessary.
Examination
All components can now be examined and inspected,
paying particular attention to the following.
1. Inspect friction plates (3 & 6) and friction surface on
pressure plate (4) for wear or damage.
2. Examine friction plates (3) and brake shaft (1) for
wear or damage to splines.
3. Examine input and output splines of brake shaft (1)
for wear or damage.
4. Examine compression springs (22 & 23) for damage
or fatigue.
5. Check ball bearing (10) for axial float or wear.
6. Examine O-ring seals (15 & 17) and backing rings
(16 & 18) for damage.
7. Obtain replacement parts as required.
Assembly
Clean all parts thoroughly.
Reverse procedure previously outlined in Dismantling
instructions taking particular care with.
a. Assembly of shaft seal (12).
b. Assembly of bearing (10).
c. Quantity and orientation of springs (8).
d. Assembly sequence of friction plates (3 & 6).
1. Lightly lubricate rotary shaft seal (12) and assemble
to housing (2) taking care not to damage seal lip.