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7. TROUBLESHOOTING DIAGNOSIS
Table 11. Troubleshooting
SYMPTOM POSSIBLE CAUSE REMEDY
Couplers are not engaged Connect couplers securely
Relief valve set incorrectly
Adjust main and secondary relief
valve
Malfunction of the hydraulic pump Repair pump
Nitrogen gas pressure is too high Adjust gas pressure
Main valve is damaged Replace main valve
Hammer
does not run
Piston is damaged Repair or replace piston
Couplers are not fully engaged Connect couplers securely
Relief valve set incorrectly
Adjust main and secondary relief
valve
Malfunction of the hydraulic pump Repair pump
Oil temperature is too high
(exceeds 180°F or 80°C)
Check oil cooler
Main valve is damaged Replace damaged main valve
Decreased oil flow Avoid simultaneous axis movement
Auto shut-off in operation, tool is
suspended
Apply proper down force
Excessive bushing wear Replace worn bushings
Hesitation or
erratic
operation
Piston is damaged Repair or replace piston
Nitrogen pressure is too high Adjust gas pressure
Hydraulic oil leakage into the gas
chamber
Replace seal kit
Malfunction of the hydraulic pump Repair pump
Slow impact
speed
Deteriorated or contaminated oil Change oil
Nitrogen gas pressure is low Adjust gas pressure
Relief valve set incorrectly
Adjust main and secondary relief
valve
Low impact
power
Malfunction of the hydraulic pump Repair pump