2 - 6
Flow Testing & Pressure Testing
!!
WARNING
Hydraulic Fluid
Fine jets of hydraulic fluid at high pressure can penetrate
the skin. Do not use your fingers to check for hydraulic
fluid leaks. Do not put your face close to suspected
leaks. Hold a piece of cardboard close to suspected
leaks and then inspect the cardboard for signs of
hydraulic fluid. If hydraulic fluid penetrates your skin, get
medical help immediately.
INT-3-1-10/1
!!
WARNING
Hydraulic Pressure
Hydraulic fluid at system pressure can injure you. Before
disconnecting or connecting hydraulic hoses, stop the
engine and operate the controls to release pressure
trapped in the hoses. Make sure the engine cannot be
started while the hoses are open.
INT-3-1-11/1
Prepare the Machine
1 Park the machine on firm level ground, engage the
parking brake and set the transmission to neutral.
Lower the backhoe and loader end to the ground and
stop the engine.
2 Operate the loader valve block control levers back and
forth to vent residual hydraulic pressure.
3 Flow Testing
a Connect a suitable pressure gauge, flow meter and
flow restrictor valve across the flow and return
couplings on the machine, as shown at A. For
reference, items are identified as:
X = Pressure Gauge
Y = Flow Meter
Z = Flow Restrictor Valve
CAUTION: Make sure that the flow restrictor valve Z is fully
OPEN (the adjusting knob screwed fully out) before starting
the engine.
b Start the engine and set the R.P.M. to 1500.
c Enable the HTC circuit, i.e. press the HTC switch B
to the 'ON' position.
d Note the flow meter reading, the valve should be
set at 20 litres/min. If adjustment is required,
loosen locknut C and turn adjusting screw D until
the correct flow is obtained.
4 Pressure Testing
a Use the flow restrictor valve to pressurise the
circuit. As the pressure rises watch the flow
reading, it should start to fall when the pressure
reaches 138 bar (2000 lbf/in
2
)
b If adjustment is required, loosen locknut E and turn
adjusting screw F until the correct pressure is
obtained.
5 Stop the engine, vent residual pressure and remove the
pressure gauge, flow meter and flow restrictor valve.
Section A Attachments
9803/7130
Section A
2 - 6
Issue 1
Hydraulic Tool Circuit (H.T.C.)
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