Hydraulic Pressure Low

Hydraulic system pressure is below the minimum operating threshold. Actuators may move slowly, stall, or not move at all.

Probable Causes (ranked)

• Hydraulic pump worn — internal bypass leaking, not building pressure
• Hydraulic fluid level low — check reservoir sight glass
• Relief valve set too low or stuck open — bypassing fluid back to tank
• Major external leak at hose, fitting, or cylinder seal
• Hydraulic filter clogged — restricting flow to pump inlet causing cavitation
• Pump drive coupling broken or motor not running

Fix Steps

1. 1 Check hydraulic fluid level at reservoir sight glass — fill if low with correct fluid type
2. 2 Inspect all hoses, fittings, and cylinders for visible leaks — look under machine for puddles
3. 3 Check hydraulic pump motor — verify it is running and coupling is intact
4. 4 Read system pressure at the gauge — compare to nameplate or setup sheet spec
5. 5 Check and replace hydraulic filter if pressure drop indicator is showing clogged
6. 6 If pressure still low with no leaks, relief valve may need adjustment or pump may need replacement
7. 7 Check hydraulic fluid temperature — overheated fluid loses viscosity and reduces pressure

Suggested Replacement Parts

Parts matched to fault category: Hydraulic Pump

Prices are estimates. Verify part numbers match your equipment before ordering.

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