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In some working environments with a high ambient temperature, the oil temperature may affect hammer in its
performance and durability. The hydraulic system of the carrier must have a proper cooling system according
to these working environments.
The temperature of the hydraulic oil must never exceed the permissible maximum oil temperature. If higher
temperatures are measured in the tank, the hydraulic system and/or the pressure-relief valve have to be
checked. Troubles due to incorrect oil viscosity or improper oil temperature are as follows:
Too thick oil (too low oil temperature) may cause:
Slow or irregular blows and difficult to start
Damage to the hammer parts by cavitation
Low impact power
Too thin oil (too high oil temperature) may cause:
Decreasing of flow delivery from carrier’s pump
Low impact rate; low breaking efficiency
Insufficient lubrication; accelerated wear of hammer parts and damage to the sealing parts
When using special oils (e.g. biological oils or fire-resistive oils), contact oil manufacturer or PRODEM.
Hydraulic oil filter
Contamination of the hydraulic oil may result in parts damage, not only to the hammer, but also to the
hydraulic components of carrier.
Impurities in the hydraulic oil can cause
Accelerated parts wear
Stick or seizure of moving parts or Score on the sliding surface of moving parts
Oil leak and decreasing of hammer efficiency
Deterioration of oil quality
Air bubble and water are also impurities in hydraulic oil and may induce cavitation failure.
Check the oil filter in the return line of the carrier’s hydraulic system, the grade of this filter should not exceed
50 micrometers and a magnetic separator should be fitted.
We recommend hydraulic oil and oil filter replacement, as shown in the following table, and this is based on
100% hammer operation.
Replacement intervals for hydraulic oil and oil filter:
250
0
20
40
60
80
100
0
500
1000
MACHINE OPERATING HOURS
B
R
E
A
K
E
R
O
P
E
R
A
T
IO
N
R
A
T
E
(
%
)
Full time hammer operation
Hydraulic oil replacement : 500 hours
Filter replacement
: 100 hours
Operation without hammer work
Hydraulic oil replacement : 1,000 hours
Filter replacement
: 250 hours
Filter
Hydraulic Oil
