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Enerpac ZA4T-Series User Manual

Page 6

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6

Trouble-shooting Guide

Problem

Pump will not start

Motor stalls under load

Pump fails to build pressure or less
than full pressure

Wrench will not retract

Low oil fl ow rate

Possible Cause

Air turned off or line blocked

Low air pressure

Muffl

er plugged; contaminated air

Low oil level

Relief valve set too low

External system leak

Internal leak in pump

Internal leak in valve

Internal leak in system component

Valve malfunction

Return fl ow line restricted or blocked

Inadequate air supply

Dirty air fi lter

Clogged inlet fi lter

Action

See section 5.0 Operation for details

See section 4.8

Reduce load or add cylinder capacity

Check hydraulic couplers for full engagement

Add oil per section 4.4

Adjust per section 5.4

Inspect and repair or replace

See authorized service center

See authorized service center

See authorized service center

See authorized service center

Check couplers for full engagement

See Section 4.3

See Section 6.4

See Section 6.4