M48 Tank
3.5.For complete brake adjustment procedures, refer to the “Brake Adjustment” section of this manual. For the purpose of tracking, insure that the brake linkage bellcranks and rods are well lubricated, not damaged, and work as intended. See Figure 3.5.
BRAKE CONNECTING
ROD
Brake
Link
REAR BRAKE
ARM ASSEMBLY
BELLCRANK
MOUNTING
SHAFT
Figure 3.5
3.6.To check for brake drag, open the the relief valve on each hydro pump. With the parking brake released, both wheels should rotate with hand pressure. See Figure 3.6.
OPEN
HYDRO PUMP
HYDRO RELIEF VALVE
Figure 3.6
NOTE: Some hydraulic system drag will be present, but a dragging brake will be immedi- ately apparent.
3.7.If in doubt about the source of brake drag, dis- connect the brake link rod from the actuator arm on the brake assembly. The actuator arm should return to center, releasing the brakes. See Figure 3.7.
BRAKE LINK
BRAKE ACTUATOR
ARM
Figure 3.7
3.8.Check the condition of the belt tensioner and belt that drives the hydro pumps. See Figure 3.8.
DRIVE BELT
TENSIONER
Figure 3.8
3.9.Before making neutral control and tracking adjustments, make sure the relief valves on both hydro pumps are fully closed.
3.10.To check neutral control, safely lift and support the rear wheels of the Tank.
3.11.Start the engine, and release the parking brake. Do not move the lap bars from the neutral posi- tion. If either wheel rotates, neutral control adjustment will be necessary. Turn off the engine.
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