HYDRAULIC SYSTEM NBT30H-2 SERVICE MANUAL
2-26 03-20-2019 Control # 613-06
System Operating Hot
Check fluid level in reservoir.
Insufficient volume of hydraulic
fluid will not meet cooling
demands of system.
Fill reservoir to proper level.
Inspect heat exchanger. Check
air flow and input air
temperature for the heat
exchanger.
Insufficient air flow, high input air
temperature, or undersized heat
exchanges will not meet cooling
demands of the system.
Clean, repair, or replace heat
exchanger as required.
Check external system relief
valve setting.
Fluid passing through relief valve
adds heat to system.
Adjust external system relief valve
setting. External relief valve
setting must be above pressure
compensation setting for proper
operation.
Check pump inlet pressure/
vacuum.
High inlet vacuum adds heat to
system.
Correct inlet pressure/vacuum
conditions.
Low Pump Output
Flow
Check fluid level in reservoir.
Insufficient hydraulic fluid will
limit output flow and cause
internal damage to pump.
Fill the reservoir to proper level.
Hydraulic fluid viscosity above
acceptable limits.
Fluid viscosity above acceptable
limits or low fluid temperature will
not allow the pump to fill or the
controls to operate properly.
Allow system to warm up before
operating, or use fluid with the
appropriate viscosity grade for
expected operating temperatures.
Check external system relief
valve setting.
Eternal relief valve set below
pressure compensation setting
causes low output flow.
Adjust external relief valve
following manufacturer’s
recommendation. External relief
valve setting must be above
pressure compensation setting to
operate properly.
Check pressure compensation
and load sense control setting.
Low pressure compensation
setting prevents the pump from
achieving full stroke.
Adjust pressure compensation
and load sense setting.
Check pump inlet pressure/
vacuum.
High inlet vacuum causes low
output flow.
Correct inlet pressure conditions.
Check input speed. Low input speeds decrease flow. Adjust input speed.
Check pump rotation.
Incorrect rotational configuration
causes low flow.
Use pump with appropriate
rotational configuration.
Troubleshooting Chart (Continued)
CONDITION ITEM POSSIBLE CAUSE POSSIBLE SOLUTION
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