17
3. Check free length of each brake spring. Minimum free
length is 15/16 inch (23.8 mm). Check springs for any
signs of cracking or failure. If a brake spring must be
replaced for any reason, then ALL brake springs must
be replaced.
4. Place the motor support on workbench with the motor
mounting surface down and install one spacer plate (item
24). Insert a steel disc (item 28) against the spacer plate,
followed by a friction disc (item 27). Alternately install
steel and friction discs until seven (7) friction discs and
eight (8) steel discs have installed, finishing with a steel
disc. Install the second spacer plate (item 24) on top
of the last steel disc.
NOTE: It is a good practice to lubricate the discs with
gear oil prior to installation.
5. Install backup ring (item 30) onto the motor support
with the flat side down. Install O-ring (item 29) onto the
motor support. The O-ring will fit into the groove in the
backup ring.
6. Lightly lubricate the brake piston seal with hydraulic
oil and install the seal onto the motor support. The seal
MUST be installed with the wide end down, toward the
O-ring installed in the last step.
CAPSTAN DRIVE
ASSEMBLY
1. If any of the oil drain plugs or vent was previously
removed, install them into the main housing using a non-
hardening thread sealing compound. Press bearing cups
(items 7 & 9) into the housing. Install the larger bear-
ing cone (item 6) into the cup (item 7). Apply a non-
hardening sealant on the outside diameter of the seal
(item 5) and press it into the housing (item 1) with the
spring side toward the bearing, using a flat plate to avoid
distortion. Lightly lubricate the sealing and bearing sur-
faces of the output shaft and insert the shaft into the
housing from the output end, being careful not to dam-
age the seal. Install the smaller bearing cone (item 8)
onto the output shaft through the inside of the housing.
FAILURE TO REPLACE BRAKE SPRINGS AS
A SET MAY RESULT IN UNEVEN BRAKE APPLI-
CATION PRESSURE AND REPEATED BRAKE
SPRING FAILURE.
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