Allied AR110C, Safety, Operation And Maintenance, Page: 51 / 60

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14.0 Technical Information –[cont’d]
14.2 Testing the Hydraulic Circuit
The hydraulic breaker is designed to perform
efficiently and reliably at the prescribed
specifications. Performance is negatively impacted if
the hydraulic system is operating at a diminished
capacity and/or set outside the permissible range.
Performance evaluation of the carrier's hydraulic
circuit is important before the breaker is used.
Accurate assessment entails thorough testing under
varied conditions, including temperature, work mode,
engine speed and load.
Tools required to complete these tests include a flow
meter and pressure gages. Record the test
measurements in the worksheet provided below.
Then compare the results with the Technical Data
section of this manual.
If the Breaker is not working or underperforming,
thoroughly check the hydraulic system of the carrier
before disassembly of the Breaker. Be sure to include
the hoses attached to the breaker to eliminate any
possible faults, e.g. collapsed hose.
Work Mode Engine RPM Flow [GPM]
Load
Pressure
[PSI]
Oil Temp
[ºF]
Relief
Pressure
[Crack] Relief
Pressure
[Static] Return
Pressure
[PSI]
0
1000
1500
1800
2000
2200
2400
2600
2800
3000
3200
3400
CAUTION
Before starting, make sure the circuit to be tested
has a relief valve. Open restrictor valve on flow
meter. Procedures can vary depending on specifics
of your equipment. Follow the instructions provided
by the manufacturer of the carrier and flow meter
when testing.
Work Mode – Set to Breaker position (if equipped).
Engine RPM
– Set to normal operating speed
Flow [GPM]
– Record measured flow at each load
pressure
Load Pressure [PSI]
– Steadily increase load with
restrictor valve on the flow meter
Oil Temperature – Testing must be done while the
hydraulic oil temperature is at normal operating
temperature. Stop test if temperature exceeds 176

F
(80

C)
Relief Pressure [Crack]
– Steadily close restrictor
valve until pressure gage indicates relief valve has
cracked open.
Relief Pressure [Static] – After cracking pressure is
reached, steadily close the restrictor valve until flow
gage indicates relief valve is fully open.
Return Pressure [PSI]
– Record the pressure
measured in the return line. Measuring point for gage
must be located near breaker’s outlet port.