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Brake Test
Prior to brake check remove Motor, Tubing and Elbow as per
Motor disassembly instructions in the following subsections.
To perform a brake check, use a 7/16-20 thread fitting. Install a
hydraulic hand pump with pressure gauge into brake port in
Brake Housing using thread fitting.
Place ROLL TEST Tool into Sun gear (8).
Apply 25 in-lb (29 kgcm) torque. While trying to rotate tool,
pump the handle on the hydraulic hand pump and increase
the pressure until the brake releases. The brake is released
when you are able to rotate the tool.
Record the release pressure. If brake does not release within
limits shown in Table 3-1, Brake Chart, check to see if it has the
proper number of springs using the SPRING CHECKING PRO-
CEDURE.
Increase to maximum pressure (refer to Table 3-1) and hold at
that pressure for one minute. If the brake does not leak or lose
pressure, the unit has passed the brake test. If brake loses pres-
sure, attempt to repair leak using the leak repair procedure at
the end of this procedure.
While brake is still released, roll check the unit for one revolu-
tion of the output member by rotating the tool. Bleed off pres-
sure slowly while rotating the ROLL TEST Tool.
Record the pressure at which the brake locks up. Using a clean
rag, wipe off excess fluid from around brake port and install
the pipe plug.
Table 3-1. Brake Chart
Release
Release
Number Of
Pressure
Pressure
Springs
Minimum
Maximum
(psi)
(psi)
7
75
124
31215019
Full
Maximum
Brake
Release
Release
Torque
Pressure
Pressure
(in-lbs)
(psi)
(psi)
140
2000
472
SECTION 3 - CHASSIS & TURNTABLE
Spring Checking Procedure
Install two Flat Socket Head Capscrews 0.250-20 UNC, 1/2"
length into holes in brake piston. Tighten bolts evenly to
ensure that brake piston remains straight while being com-
pressed into brake cavity of brake housing.
Carefully remove retaining ring from brake housing. Slowly
remove bolts evenly from the input brake. Remove the pres-
sure plate from the end of the input brake and check the num-
ber of springs in brake. If incorrect, correct the count.
Check for the correct number of
springs per Table 3-1.
Install the Pressure Plate using two 0.250-20 UNC flat Socket
Head Capscrews. Tighten bolts evenly to ensure that Pressure
Plate (8M) does not get wedged to the Brake Cylinder.
3-9
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