JLG G6-42P Service Manual - Manual (Page 331)

39
Section 4
Assembly and Installation
• If there are no leaks, proceed to Step 4.
• If there are leaks, disassemble brake housing
assembly, find and correct the problem. Repeat
Steps 1 to 3.
4. Wait five minutes, then apply 75 to 110 psi
(5.1 to 7.6 bar) to the cylinder again.
• If there are no leaks, the assembly is
assembled correctly.
• If there are leaks, find and correct the problem.
Repeat the test again.
Assemble Three Function
Brake Housing Assembly
NOTE
Before assembling brake housing assembly,
make sure that all surfaces and bores of brake
housing and piston are free of dirt, burrs
and nicks.
1. Select piston shim pack with the following
procedure:
a. Position parts of piston assembly in a press.
Measure the dimension “A” under 441 lb
(200 Kg) pressure. Figure 4.50.
b. Measure the dimension “B”. Figure 4.51.
Figure 4.50
“A”
441 lb (200 Kg)
PISTON
WITHOUT
SPRINGS
ACTION PLATE
BRAKE DISCS
REACTION
PLATE
c. The shim pack thickness is the difference
between dimension “B” and dimension “A”
minus 0.06 in. (1.5 mm):
B-A-0.06 in. (1.5 mm) = shim pack thickness
d. If brake piston is assembled, the shim pack
thickness, under press pressure of 441 lbs
(200 Kg), is the difference between dimension
“B” minus the sum of dimensions “C” and “D”
minus 0.06 in. (1.5 mm):
B-(C+D) -0.06 (0.15) = shim pack thickness.
Figure 4.52.
Figure 4.51
Figure 4.52
“B”
“C”
600 lb (300 Kg)
250 lb (113 Kg)
BRAKE
DISCS
PLATE
“D”