SECTION 3 - CHASSIS & TURNTABLE
3120740
– JLG Lift –
3-61
3.14
SWING BRAKE - AUSCO (PRIOR TO
S/N 0300064566)
Disassembly
1.
With the shaft protrusion downward, Disassemble the
parts in the following order; bolts (24) alternately, wash-
ers (23), power plate (21), and gasket.
2.
Remove the following parts; stationary discs (14), rotat-
ing discs (12), primary disc (11), torque pins (3), springs
(8 & 9), and the spring retainer (7).
NOTE:
If the bearing and seal are removed for any reason, both
must be replaced.
3.
Further disassembly is not recommended and should
not be attempted unless necessary to replace the bear-
ing (4), the seal (6), or the shaft (10). If further dissembly
is needed, proceed as follows;
a.
The shaft (10) may be removed by pressing on the
end of the shaft with a shop press.
b.
Using an appropriate tool, pry the seal (6) out from
the inside of the brake. Take care not to damage the
bore. Remove the retaining ring (5). Tap the bearing
(4) out with a plastic mallet.
4.
Remove the piston (15) from the power plate (21) by
introducing low pressure air into the hydraulic inlet and
make sure the piston is directed away from the operator.
Remove the o-rings (17&19) and backup rings (16 & 18)
from the piston O.D. and I.D. grooves. Do not remove
backup rings (16 & 18) unless replacement is necessary
because they will be damaged. With shaft protrusion
downward, remove the end cover (13) by removing cap-
screws (12).
Inspection
1.
Clean all parts thoroughly.
2.
Closely inspect all parts for excessive wear, cracks and
chips. Replace parts as necessary.
3.
Discard seals and o-rings.
4.
Closely inspect bearings and bearing contact surfaces.
Replace as necessary.
NOTE:
Bearings may be reused if, after thorough inspection, they
are found to be in good condition.
Assembly
NOTE:
Lubricate all seals and o-rings with clean hydraulic oil prior
to assembly.
THERE MAY BE MORE PARTS IN A SERVICE KIT THAN YOUR BRAKE REQUIRES.
CHECK THE PARTS LIST CAREFULLY FOR THE EXACT QUANTITY. IN THE CASE OF
SPRINGS, SPACE THE SPRINGS AS SHOWN IN FIGURE 3-41.
1.
Worn o-rings and damaged or worn Teflon backup rings
must be replaced prior to assembly.
2.
The cylinder of the power plate, piston, and o-rings must
be clean prior to assembly and pre-lubed with the sys-
tem hydraulic fluid.
THE DEPTH THE PISTON IS INSTALLED INTO THE POWER PLATE IS CRITICAL.
THE SURFACE OF THE PISTON AT THE CUTOUTS MUST BE FLUSH TO 0.120 IN
(3.0 MM). BELOW THE SURFACE OF THE POWER PLATE. DO NOT EXCEED THE
0.120"(3.0 MM) DEPTH OR THE PISTON WILL COCK RESULTING IN COMPLETE
LOSS OF BRAKING.
3.
Assemble the piston (15) into the power plate (21) using
a shop press, being careful not to damage the o-rings or
Teflon back-up rings. Visually align the center of the cut-
outs in the piston with the torque pin (3) holes in the
power plate (21).
4.
For replacement of the seal;
a.
Use a shop press to install the bearing (4) into the
housing. Press the outer surface of the bearing only.
Install the retaining ring (5) into the groove.
b.
Press the seal (6) into the housing (1) until it is flush
with the face of the housing. The lip of the seal must
face towards the bearing.
5.
Press the shaft into the housing until it stops on the
bearing. Support the inner race of the bearing during
the press operation.
6.
Rotating discs must be clean and dry. The lining material
and mating surfaces of the stationary discs must be
thoroughly clean and free of debris. Worn or scored
rotating discs must be replaced.
7.
Install bolts (24) with washers (23) in the power plate
(21. Tighten sequentially, one turn at a time, until the
power plate is properly seated. Torque 105 to 115 Ft.
Lbs. (147 to 161 Nm)
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