JLG 26MRT ANSI Service Manual - Manual (Page 36)

SECTION 2 - PROCEDURES
2-24 – JLG Sizzor – 3120791
2. Tap the female end of the spline shaft assembly and
spring plate with a soft mallet to separate the cover
from the spring plate. If the sections will not sepa-
rate, carefully pry the sections apart with a screw-
driver.
3. Remove the retaining ring from the spline shaft
assembly.
4. Remove the spline shaft assembly from the cover by
tapping the male end of the spline shaft assembly
with a soft mallet.
5. If necessary, remove the retaining ring from the
spline shaft assembly and remove the outer spline
from the shaft.
6. Remove the retaining ring from the cover and press
out the oil seal and bearing, if necessary.
7. Remove the four socket head shoulder bolts.
DO NOT REMOVE THE SHOULDER BOLTS WITHOUT PRESSURIZ-
ING THE BRAKE APPROXIMATELY 300 PSI (21 BAR), OR DAM-
AGE TO THE BRAKE MAY RESULT.
8. Before removing the primary disc, rotor discs, and
stator discs, note the pattern for reassembly pur-
poses.
9. Release the pressure to the brake before removing
the four socket head cap screws.
10. Remove the spring plate.
11. Remove the case gasket from the spring plate.
12. Before removing the springs (21-red or 25-blue),
note the pattern and color for reassembly purposes.
13. Remove the piston by carefully exerting hydraulic
pressure through the brake release port on the pres-
sure plate.
14. Remove the o-rings and back-up rings from the pis-
ton. Take care not to scratch or mar the piston.
15. Remove the case gasket from the pressure plate.
Assembly
NOTE: Prior to assembly, clean all parts thoroughly and
lubricate all rubber components with clean sytem
hydraulic fluid.
1. Press the oil seal into the cover bore until it is flush
with the bearing shoulder. Ensure the oil seal is
installed with the open side facing the pilot end of
the cover.
2. Press the bearing into position until it bottoms out
on the oil seal borestep.
3. Install the retaining ring into the cover.
4. If disassembled, install the outer spline onto the
shaft and secure in place with the retaining ring.
5. Press the spline shaft assembly into the bearing until
the shaft bottoms on the shaft shoulder. The bearing
inner race must be supported during this operation.
6. Install the retaining ring on the shaft.
7. Install the back-up rings on the piston toward the
spring pockets.
8. Install the o-rings on the piston. Ensure the o-rings
and flat and all twists are removed. Take care not to
scratch or mar the piston.
9. Lubricate the piston with clean system hydraulic
fluid. Carefully press the pistion into the pressure
plate.Ensure the piston is oriented such that the
threaded holes in the piston are in alignment with
the thru holes in the spring plate when installed.
10. Install the springs (21-red or 25-blue) according to
the pattern and color noted during disassembly. Dif-
ferent color springs must be alternated.
11. Affix case gaskets to the pressure plate and the
spring plate.
NOTE: Bolts should have one or two drops of Loctite #242
applied to the threads prior to assembly.
12. Place the unit on a press. Using the press, depress
and install four socket head bolts. Torque the bolts
to 35-40 ft. lb. (48-54 Nm). A suitable holding fixture
is useful to hold the brake in position.
13. Install the stator discs and rotor discs in the same
sequence as noted during during disassembly.
14. Install the primary disc.
NOTE: Bolts should have one or two drops of Loctite #242
applied to the threads prior to assembly.
15. Align the discs and partially screw in the four socket
head shoulder bolts. Inspect for free movement of
stack. Pressurize the brake release approximately
300 psi (21 bar) to release the discs. Torque the
shoulder bolts to 15-18 ft. lb. (20-24 Nm) and release
the pressure. A suitable holding fixture is useful to
hold the brake in position.
NOTE: Bolts should have one or two drops of Loctite #242
applied to the threads prior to assembly.
16. Install the cover using socket head assembly bolts.
Torque bolts to 9-11 ft. lb. (12-15 Nm).