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3)
BRAKE OVERHEATS
Condition
Overheating due to
excessive duty cycle.
Inadequate coolant flow
Low or no coolant.
Brake drags.
4)
BRAKE DOES NOT APPLY
Condition
Low or no pressure to
brake
Possible cause
Inadequate coolant flow or heat
exchange.
Low pump output, blocked filter or
coolant lines.
1. Improper fill or leaks.
2. Leaking face seal.
3. Loose or damaged plugs.
4. Deteriorated or inadequate
sealant used at joint.
1. More than 1.4bar(20psi) pressure
applies when brakes released.
2. Damaged piston return spring
assembly.
3. Piston not returning.
4. Wrong cooling and/or actuation
fluid used.
5. Tight or damaged splines(eg.
friction disc-to-hub driver).
Possible cause
1. Empty fluid reservoir.
2. Damaged hydraulic system.
3. Leaked of brake actuation fluid.
4. Parking brake not adjusted
properly.
1. Install brake cooling system if not already
installed on vehicle.
2. Re-analyze and re-size brake cooling system
if necessary.
Check pump output at different operating
modes. Replace filter and check lines.
1. Check for proper fill level.
2. Replace or reinstall face seal assembly.
3. Tighten drain, fill or forced cooling plug.
Replace if damaged.
4. Dissemble, clean, re-seal and re-assemble
brake housing joint.
1. Repair hydraulic system so pressure is less
than 1.4bar(20psi) when brakes released and
while machine is operating in any mode.
2. Repair or replace piston return spring
assembly.
3. Check piston seals and seal separator.
4. Check piston seals and seal separator for
swelling or damaged. Replace as necessary.
Purge system and use correct fluid.
5. Repair or replace parts.
1. Fill reservoir to correct level with specified
fluid.
2. Repair hydraulic system.
3. Refer to "Brake leaks actuation fluid" in this
section.
4. Adjust parking brake lever as described in
assembly of this manual.
3-55
Correction
Correction
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