Sand Pro 2040Z Page 4 - 23 Hydraulic System
The RH transmission gear pump flow test should be per-
formed to make sure that the gear pump flow for the rear
lift circuit and RH transmission charge circuit is correct.
Procedure for RH Transmission Gear Pump Flow
Test:
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
2. Park machine on a level surface with the rear attach-
ment lowered. Make sure engine is off and that the park-
ing brake is applied.
3. Read and follow Precautions for Hydraulic Testing at
the beginning of this section.
IMPORTANT: Make sure to thoroughly clean around
all hydraulic connections that will be disassembled.
4. Disconnect hydraulic hose from fitting in control
manifold port P to allow tester with pressure gauge and
flow meter installation (Fig. 24).
5. Install tester with pressure gauge and flow meter be-
tween disconnected hose and manifold fitting. Make
sure that tester flow arrow points from the hose and to-
ward the control manifold. Also, make sure the flow
control valve on the tester is fully open.
6. Make sure that motion control handles are in the
neutral locked position, the rear attachment switch is in
neutral and the parking brake is applied.
7. Start engine and run at low idle speed. Check for hy-
draulic leakage and correct before proceeding with test.
8. Operate engine at full speed (2850 RPM). Verify en-
gine speed with a phototac.
9. Watch pressure gauge on tester carefully while slow-
ly closing the flow control valve until 400PSI(28bar)is
obtained. Verify that the engine speed is still 2850 RPM
(verify engine speed with a phototac).
NOTE: If engine speed drops during testing, pump flow
will decrease and flow test results will be inaccurate.
10.Observe flow gauge on tester. Flow indication should
be approximately 2GPM(7.6LPM).
11. Once flow has been determined, open flow control
valve on tester, reduce engine speed and turn engine
off. Record test results.
12.If 400 PSI (tester pressure), 2850 RPM (engine
speed) or 2GPMflowcannot be achieved, consider the
following:
A. If the engine speed drops excessively (below
2850 RPM) as the tester f low control valve is closed,
engine performance should be evaluated (see
Chapter 3 - Gasoline Engine).
B. If engine speed does not drop and pressure and
flow specifications are not met, the gear pump in the
RH transmission needs to be repaired or replaced as
necessary. The transmi ssion needs to be disassem-
bled to inspect the gear pump.
NOTE: If gear pump in RH transmission is faulty,
charge pressure for RH transmission will be affected
leading to possible piston pump and/or motor wear or
damage in RH transmission.
NOTE: The implement (lift) relief valve pressure can
also be measured with hydraulic tester (flow meter)
positioned as described in this test. If necessary, per-
form the relief valve pressure test before removing the
tester from the machine (see Implement (Lift) Relief
Valve Pressure test Test in this section).
13.When testing is complete, remove hydraulic tester
(flow meter) and reconnect hydraulic hose to fitting on
control manifold.
14.Make sure hydraulic reservoir is full before returning
machine to operation.
1. RH transmission
2. Control manifold
3. Hose to port P
Figure 24
3
1
2
FRONT
Hydraulic
System
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