Technical Data; Troubleshooting; Machine Data - Chicago Pneumatic BRK 25 Sicherheits- Und Betriebsanleitung

Safety and operating instructions

Technical data

Troubleshooting

Problem
Breaker does not work. Pressure is not built
up when trigger is activated
Breaker does not work. Pressure is built up
when trigger is activated
Breaker runs weakly or irregularly
Hoses pulsate
Oil leaking from breaker
Working tool falls out

Machine data

Shank
dimension
(mm)
BRK 25 D 22 x 82.5
BRK 40 25 x 108
28 x 160
32 x 152
32 x 160
BRK 40 VR 25 x 108
28 x 152
32 x 152
32 x 160
20
Cause
No or incorrect flow/pressure
P and T hoses interchanged
Insufficient activation of trigger valve
Diaphragm failed
Back pressure too high
Quick-release coupling in return line
defective
Striking piston sticks, possibly due to
thickening of cylinder
Spool/reversing spool or auxiliary spool
sticking
Seals defective
Insufficient flow
Seals defective
Wear, internal leakage
Accumulator defective
Seals defective
Worn latch
Worn chisel bushing or tool
Impact
Weight Length
(kg) (mm)
12.6 600
17.5 640
19 690
19 690
19 690
22 650
23.5 700
23.5 700
23.5 700
Solution
Check flow/pressure by means of test
equipment
Check connection. Standard connection has
oil flowing from male quick-release coupling
(i.e. the tail-hose of the breaker P connection
is fitted with female coupling)
Adjust trigger lever (if adjustable) or replace
defective parts
Dismount, check and replace seals
Make direct tank connection. Max. back
pressure 10-15 bar (150-200 psi) measured
at breaker
Locate and replace defective coupling
>
>
>
Dismount and check that all parts move
easily. Polish slightly if necessary
Dismount, check and replace
Check flow/pressure
Replace seals
>
>
>
Replace accumulator diaphragm and charge
with nitrogen
Replace seals
Replace latch and roll pins
Replace bushing or tool
Accumulator Operating
freq. pressure pressure
(Hz) (bar)
40 40
27 40 95-115
27 40 95-115
27 40 95-115
27 40 95-115
27 40 95-115
27 40 95-115
27 40 95-115
27 40 95-115
3392 5166 90 | Original instructions
BRK 25, 40, 55, 70, 95
Push the breaker hard against the
working tool
Chamfer/polish the edge slightly at the
cylinder dashpot (where the cylinder bore
changes size)
Check oil viscosity. Thin oil increases the
risk of thickening
Dismantle, check and replace defective
or worn parts
Check oil for impurities and oil viscosity
at working temperature
Thin oil = increased internal leakage
Flow rate EHTMA
(bar) (l/m) Category
70-90 18-22
18-22
18-22
18-22
18-22
18-22
18-22
18-22
18-22
C
C
C
C
C
C
C
C
C