4
6
11.2
Impact rate of hydraulic breaker too low
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Cause
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Remedy
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by
I
nade
q
uate hydraulic oil deli
v
ery
Correct e
x
ca
v
ator engine speed;
check operating pressure;
check setting on carrier
E
x
ca
v
ator dri
v
er
L
oose coupling in pressure or
return line
Check coupling, tighten
if necessary
E
x
ca
v
ator dri
v
er
Check
v
al
v
e in pressure or return
line partially closed
O
pen check
v
al
v
e
E
x
ca
v
ator dri
v
er
Flow resistance too high on oil
filter or oil cooler
Check oil filter
/
cooler, clean or
replace
E
x
ca
v
ator dri
v
er
G
as pressure in piston accumula
tor too high
Check gas pressure in piston
accumulator, bleed off if
necessary
E
x
ca
v
ator dri
v
er
Working tool jams in lower
hammer part
Note:
contact pressure must be
applied along hydraulic breaker
a
x
is
Correct boom direction; deburr
working tool; check wear to work
ing tool and wear bushes
E
x
ca
v
ator dri
v
er
I
nside diameter of return line too
small
Change inside diameter
Refer to
S
3
, Technical
specifications
Workshop
Return pressure too high
Check and lower return pressure
Chicago Pneumatic Customer
Center
/
dealer in your region
Hydraulic oil returns to tank
v
ia
v
al
v
e section.
Not permitted!
Note:
hydraulic oil must return di
rect to tank or to filter
Chicago Pneumatic Customer
Center
/
dealer in your region or
Workshop
Diaphragm in pressure
accumulator defecti
v
e
(CP
11
50, CP
16
50, CP2250,
CP 3050, CP4250)
Note:
hose at port
»P«
jerks
v
io
lently
Replace
highpressure accumulator.
Note:
O
bser
v
e the national safety
regulations
Workshop
Temp. of hydraulic oil in tank
abo
v
e
8
0°C
Check oil le
v
el in hydraulic tank
and top up if re
q
uired
E
x
ca
v
ator dri
v
er
Hydraulic oil pressure too low
Check pressure, modify if necess
ary; fit new type
−
tested pressure
relief cartridges where necessary
Workshop
