Bandit 200UC - Page 73

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MODEL 200 UC HYDRAULICS
HYDRAULIC PUMP CHECK OUT
CORRECTING HYDRAULIC PROBLEMS
HYDRAULIC PUMP CHECK OUT USING A FLOW METER (WITH RELIEF)
To check out the hydraulic pump the mechanic will need a needle type  ow meter capable of reading 5000
psi (344 bar) and a long enough hose that will go from the  ow meter back to the  rst component.
1.
Disconnect the pressure line going from the
pump at the  rst component.
2.
Attach the  ow meter to the end of the pressure
hose (which was removed from the component).
3.
Attach the hose you supplied to the outlet of
the  ow meter and run the hose back to the  rst
component. MAKE SURE THE HOSES ARE ON
THE CORRECT SIDES OF THE FLOW METER.
4.
Make sure the pressure gauge is installed up
stream from the fl ow control valve. Failure
to do this will cause serious damage to the
hydraulic pump when testing.
5.
MAKE SURE THAT THE FLOW CONTROL
VALVE IS FULLY OPEN SO AS TO ALLOW
UNRESTRICTED FLOW TO PASS THROUGH
IT.
6.
Start the engine to engage the pump, the clutch
may have to be engaged if the pump is belt
driven.
7.
Observe the  ow rate through the meter and
pressure gauge reading to make sure a high
pressure does not exist.
Do not exceed
90% of system
pressure.
First
component
after pump.
Flow
Direction
Hydraulic
Tank
Flow Meter
(with relief)
Pump
Outlet
Hose
supplied by
you.
Flow
Direction
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8.
Increase the engine speed slowly to full rpm
and at the same time observe the pressure and
 ow rate. The pressure should still remain low.
Make a note of the  ow rate (gpm or Lpm) at
full engine rpm.
9. SLOWLY
turn the needle valve on the flow
control in and observe the pressure increase on
the pressure gauge.
10.
Continue closing the  ow control valve until the
pressure gauge reading reaches 90% of the
normal relief valve setting (example: if system
runs at 2500 psi (172 bar), do not exceed 2250
psi (155 bar).
Never allow the pressure to go more than 90%
of the main relief pressure.
11.
If the pump is good, you should have at least 80%
of the  ow rate (gpm or Lpm) passing through the
 ow meter as noted at low pressure and full rpm
(example: 10 gpm (38 Lpm) and low pressure =
8 gpm (30 Lpm) at 90% pressure).
12.
If 90% of the main relief pressure can not be
obtained and/or the  ow rate passing through
the meter is considerably less, then the pump is
worn or damaged.