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Fluid Power Information Center

Incorrect Flow Chart for Hydraulic systems

INCORRECT FLOW

A
B
C
NO FLOW
LOW FLOW
EXCESSIVE FLOW
Pump not receiving fluid
Remedy: a
Flow control set too low
Remedy: d
Flow control set too high
Remedy: d
Pump drive motor not operating
Remedy: e
Relief or unloading valve set too low
Remedy: d
Yoke actuating device inoperative(variable displacement pumps)
Remedy: e
Pump to drive coupling sheared
Remedy: c
Flow by-passing thru partially open valve
Remedy: e or f
RPM of pump drive motor incorrect
Remedy: h
Pump drive motor turning in wrong direction
Remedy: g
External leak in system
Remedy: b
Improper size pump used for replacement
Remedy: h
Directional control set in wrong position
Remedy: f
Yoke actuating device inoperative(variable displacement pumps)
Remedy: e
Entire flow passing over relief valve
Remedy: d
RPM of pump drive motor incorrect
Remedy: h
Damaged pump
Remedy: c
Worn pump, valve, motor, cylinder, or component
Remedy: e
Improperly assembled pump
Remedy: e

Remedy:a
Replace dirty filters; clean or replace reservoir breather vent; fill reservoir to proper level; overhaul or replace supercharge pump.
Remedy:b
Tighten leaking connections.
Remedy:c
Check for damaged pump or pump drive; replace and align coupling.
Remedy:d
Adjust.
Remedy:e
Overhaul or replace.
Remedy:f
Check position of manually operated controls; check electrical circuit on solenoid operated controls; repair or replace pilot pressure pump.
Remedy:g
Reverse rotation.
Remedy:h
Replace with correct unit.
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