Bandit
Copyright 1/10
PAGE 77
MODELS 65XP(XL)/95
HYDRAULIC PUMP CHECK OUT USING A FLOW METER
To check out the hydraulic pump the mechanic will need a needle type flow meter capable of reading 3000 psi
(207 bar) and a long enough hose that will go from the flow meter back to the first component.
1) Disconnect the pressure line going from the pump at the first component.
2) Attach the flow 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 flow meter and run the hose back to the first
component.
MAKE SURE THE HOSES ARE ON THE CORRECT SIDES OF THE FLOW METER.
)
Make sure the pressure gauge is installed up stream from the flow control valve.
Failure to do this will cause serious damage to the hydraulic pump when testing.
)
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 flow rate through the meter and pressure gauge reading to make sure a high pressure
does not exist.
8) Increase the engine speed slowly to full rpm and at the same time observe the pressure and flow rate.
The pressure should still remain low. Make a note of the flow 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 flow 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 flow rate (gpm or Lpm) passing through the
flow meter as noted at low pressure and full rpm (example: 10 gpm (38 Lpm) and low pressure = 8 gpm
(0 Lpm) at 90% pressure).
12) If 90% of the main relief pressure can not be obtained and/or the flow rate passing through the meter
is considerably less, then the pump is worn or damaged.
HYDRAULIC PUMP CHECK OUT
HYDRAULIC SECTION
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Hydraulic
Tank
Pump
Flow
Meter
Flow
Direction
Flow
Direction
Hose
supplied by
you.
Do not exceed
90% of system
pressure.
First
Component
After Pump
Outlet
