JLG GRADALL 522D Owner's/Operator's Manual page 136

Se c t ion 4
Asse m bly a nd I nst a lla t ion
6. After 1.47 inch (37.0 mm) dimension is obtained,
apply specified pressure to brake and check the
brake torque on pinion as shown in chart.
Torque Disc Pressure
Reduction No.
PRA-382 06 275 psi min
17.08:1 (19 bar min) (1288.0-
PRA-353 06 275 psi min
46.00:1 (19 bar min) (474.5-
NOTE
To obtain the desired brake torque, fasten or
unfasten the adjusting nut. For each 0.04 inch
(1 mm) turned on dimension "X", the variation in
torque is 4%.
7. After obtaining the desired brake torque, install nut
lock as shown in Figure 4.74. Tighten to 60-90
lb-in (80-120 N•m).
T
Figure 4.74
DIM. "Y"
ADJUSTING
NUT
46
8. Install cover. Figure 4.75.
Figure 4.75
Torque
ADJUSTING NUT
950-1200 lb-ft
1559.0 N•m)
350-500
678.0 N•m)
CYLINDER
SUPPORT
9. The dimension "Y" must be equal with ± 0.02 inch
NOTE
LOCK NUT
Do not check the brake torque before the wheel
has turned at least two times with the brake
activated.
"X"=
1.47 inch
(37.0 mm)
WITHOUT
PRESSURE
SPRING
PISTON
O-RING
(0.5 mm) on each side. If dimension is larger on
one of the sides after adjustment, disassemble
and find the cause.
COVER
LOCK NUT
O-RING
WITHOUT
PRESSURE
CYLINDER
Courtesy of Crane.Market