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8. Troubleshooting
Trouble
Probable cause
Remedy
The hammer will not start.
Pressure and return lines inverted
Connect hammer hoses correctly
Stop valve in pressure and/or
return lines closed
Open stop valves
Gas pressure in back head too
high
Check gas pressure in back head,
reset to correct value
Hydraulic oil level in tank to low
Check and refill hydraulic oil tank
Relief valve opens at to low a
pressure
Re-adjustment relief pressure
Failure in valve and piston
Contact your PRODEM dealer
Leakage from pressure to return in
excavator hydraulic circuit
Check the installation, pump and other
hydraulic components
Operating pressure too low
Check carrier engine speed and/or
operating pressure
The impact rate of hydraulic
hammer is too low
Insufficient hydraulic oil delivery
from carrier
Contact your PRODEM dealer
Flow resistance too high on oil
filter or oil cooler
Check oil filter/cooler, clean or replace
Hydraulic oil overheated
Check and replace filter, cooler
Gas pressure in back head too low Check and refill back head gas
pressure
Chisel out of range for piston
Push down chisel by carrier
Inside diameter of return line too
small
Increase inner diameter of the return
line. (Refer to section 5.1.)
Return pressure too high
Check and lower return pressure
Relief valve opens at too low a
pressure
Re-adjust the relief pressure
Hydraulic oil level in tank to low
Check and refill hydraulic oil tank
Poor pump performance
Contact authorized service man
Diaphragm in accumulator
defective
Replace diaphragm
Pressure adjustment valve is
screwed too much
Re-adjust pressure adjusting valve
(Refer to section 5.8.)
Delivery flow rate of hydraulic
system is inadequate
Check pump characteristics with
measuring device and compare with
original specifications
The impact rate is irregular
Gas pressure of accumulator is too
low
Check and refill with nitrogen gas
Failure in hammer valve or
distributor operation
Contact your PRODEM dealer
Oil leaks between back
head and cylinder
Seals defective
Check and replace seals
