Hydraulic
System
Reelmaster 6500-D/6700-D Hydraulic SystemPage 4 - 27
Transmission or Hydraulic System is Operating Hot
Cause Correction
Oil in reservoir is below level. Fill reservoir to proper level.
Contaminated oil. Drain reservoir and refill with clean oil.
Oil in system too light. Drain reservoir and refill with proper viscosity oil.
Heat exchanger defective. Check oil cooler for obstructed air flow.
Replace damaged or plugged oil cooler.
Charge pressure low. TEST NO. 1. Inspect charge relief valve R5.
Repair or replace if defective.
Transmission pressure high. Reduce transmission load. Check to make sure brakes
are not engaged.
Towing by-pass is open or defective. Close towing by-pass valve. R epair or replace if
necessary.
Wheel motor(s) worn or damaged.
NOTE: If a motor has internal damage, it is likely that
the pump and other motor are also damaged.
Inspect wheel motors and repair or replace if worn or
damaged.
Pump worn or damaged. Inspect pump and repair or replace if worn or
damaged.
Transmission Operates in One Direction Only
Cause Correction
External control linkage misadjusted, disconnected,
binding or damaged.
Adjust or repair.
Servo control valve faulty. Inspect control valve for:
Plugged control orifices.
Damaged mounting gasket.
Misadjusted or damaged neutral return spring.
Broken control connector pin.
Galled or stuck control spool.
Neutral switch misadjusted.
Repair or replace control valve if necessary.
Transmission relief valve faulty. TEST NO. 2. Inspect relief valves R6 and replace if
necessary.
NOTE: Relief valves can be exchanged in forward and
reverse pump circuits for testing.
Pump worn or damaged. Replace pump.
