16 ► P110 User Manual
TESTING & TROUBLESHOOTING
GENERAL
Tests and adjustments should be performed
periodically to ensure the power unit is operating
at maximum efficiency. Use a calibrated flow and
pressure tester. This tester can be used to isolate
problems in both the engine and hydraulic system prior
to any power unit disassembly.
TESTING THE HYDRAULIC CIRCUIT
The following tests can be performed to ensure that
the hydraulic pump is supplying the correct flow and
pressure and that the system relief valve is operating
properly.
During these tests, make sure the engine is warm and
operating smoothly. If test results are not as specified,
refer to the troubleshooting table in this section for
possible causes.
TESTING THE 8 GPM HTMA TYPE II
CIRCUIT OR THE 12 GPM TYPE III CIRCUIT
To test the circuit, proceed as follows:
1.
Set the flow selector switch to the OFF (center)
position.
2. Set the throttle control switch to AUTO-OFF
position.
3.
Use a calibrated flow and pressure tester across
two hose ends (where the tool would normally be
connected).
4. Fully open the tester restrictor valve
(counterclockwise).
5. Start the engine and allow it to run until warm.
6.
Switch the flow selector switch to 8 or 12 gpm
depending on which flow you are testing.
7. With the engine at the programed speed, the test
flow gauge should read 7-9 gpm/26.5-34 lpm or 11-
13 gpm/41.6-49 lpm.
8. Slowly turn the restrictor valve clockwise while
watching the pressure gauge. The flow rate should
stay at 7-9 gpm/26.5-34 lpm or 11-13 gpm/41.6-49
lpm as the pressure gauge reaches 2100-2200
psi/148-155 bar.
9.
At 2100–2200 psi/148–155 bar, the relief valve
should begin to open. The pressure at which
the relief valve just begins to open is commonly
referred to as the “cracking pressure”. At the
“cracking pressure,” the flow rate should start to
drop because the relief valve is allowing fluid to
bypass to the hydraulic reservoir. The “cracking
pressure” is preset at the factory and if it is not
within the above range, the relief valve must be re-
set as follows:
a. The relief valve is located on the right side of
the unit just behind the dash panel. It protrudes
out from the manifold assembly. Use a open
end or box end wrench to loosen the nut on the
relief valve.
b. Use an Allen wrench to adjust the relief valve.
Turn clockwise to raise the pressure and
counterclockwise to reduce the pressure.
c. Tighten the nut and retest.
Summary of Contents for P110
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