Toro Sand Pro 2040Z Service Manual page 51

The implement relief valve pressure test should be per-
formed to make sure that the relief pressure for the rear
lift circuit is correct.
Procedure for Implement (Lift) Relief Valve Pressure
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. 22).
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 disconnected
hose and toward 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 at tester connections and correct before
proceeding with test.
8. Operate engine at full speed (2850 RPM). Verify en-
gine speed with a phototac.
IMPORTANT: DO NOT hold system at implement re-
lief for more than a few seconds.
9. With the engine running at full speed (2850 RPM),
move rear attachment switch to the lower position.
Press and hold attachment switch in the lower position
to allow the implement relief valve to activate. The pres-
sure gauge should stabilize briefly at the implement re-
lief pressure and then may continue to increase. The
implement relief pressure is the gauge reading when
pressure stabilizes and should be from 581 to 725 PSI
(40 to 50 bar). After noting relief pressure, return lift
switch to neutral position.
Sand Pro 2040Z
10.Shut off engine and record test results.
11. If implement relief specification is not met, inspect,
repair or replace implement relief valve in RH transmis-
sion. The transmission needs to be disassembled to in-
spect the implement relief valve.
NOTE: The RH transmission gear pump flow can also
be measured with hydraulic tester (flow meter) posi-
tioned as described in this test. If necessary, perform the
flow test before removing the tester from the machine
(see RH Transmission Gear Pump Flow Test in this sec-
tion).
12.When testing is complete, remove hydraulic tester
(flow meter) and reconnect hydraulic hose to fitting on
control manifold.
13.Make sure hydraulic reservoir is full before returning
machine to operation.
FRONT
2
1. RH transmission
2. Control manifold
Page 4 - 21
1
3
Figure 22
3. Hose to port P
Hydraulic System