Hydraulic Tests (Fig. 10, 11)
1.
perature by operating the machine for approximately 10
minutes.
Make sure hydraulic oil is at normal operating tem
NOTE: At pressures above approximately 500 PSI,
mechanical override in handle will cause pump to begin
to de-stroke.
2.
sure parking brake is properly adjusted before perform
ing hydraulic tests.
Engage parking brake and stop the engine. Make
11. If you cannot get 7 GPM or 500 PSI, traction pump
may have internal damage or excessive wear.
TEST C: Traction Motor Efficiency
3.
With engine off, disconnect hose from bulkhead fitting
and install tester in series between traction pump and
wheel motor. Make sure tester flow control valve is
OPEN.
12. Lower drive wheel to ground and engage parking
brake. Block front and rear of all wheels. Chain machine
to an immovable object and remove slack from chain.
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow gauge is showing that oil will flow
from pump, through tester and to wheel motor.
13. With tester flow control valve open, slowly move
traction handle (up or down) so flow is from the pump,
through the tester, then to the wheel motor. Move trac
tion handle until maximum pressure is attained with
wheel not rotating and read flow gauge.
Test A: Charge Pressure
4.
(approx. 3500 RPM).
Start the engine and move throttle to full engine RPM
14. If flow reading is higher than 1.5 GPM, motor may
have internal damage or excessive wear.
GAUGE READING: 25 to 70 PSI no load.
1
5.
If there is no pressure, or pressure is low, inspect for
restriction in pump intake line and inlet filter. Inspect
charge relief valve and valve seat. Inspect for sheared
charge pump key. Disassemble charge pump and in
spect for internal damage or worn parts. If charge pump
is in good condition (no scoring, scratches, or excessive
wear), piston pump and motor might be suspected of
wear and inefficiency, thus charge pump is unable to
keep up with internal leakage.
2
TEST B: Traction Pump Flow
Figure 10
6.
Lift the drive wheel off the ground using a jack. Block
front and rear of the other wheels. Make sure the tester
flow control valve is OPEN.
1. Hose
2. Bulkhead fitting
7.
Start the engine and release the parking brake.
Variable Displacement Pump
8.
While watching flow and pressure gauges, move
traction handle (up or down) so flow is from the pump,
through the tester, then to the wheel motor. Move trac
tion handle until 6 GPM is obtained.
Wheel
Motor
9.
If pressure is less than 200 to 300 PSI go to step 10.
If pressure is more than 200 to 300 PSI stop the engine
and inspect for binding parking brake. Inspect for restric
tion in lines to and from motor. Iftherearenorestrictions,
motor should be suspected of having internal damage.
Tester
10.
While watching flow and pressure gauges, move
traction handle (up or down) to full speed position so
flow is from the pump, through the tester, then to the
wheel motor. Slowly close flow control valve until you
get readings of 7 GPM and 500 PSI.
Figure 11
Testing
Page 4 - 10
Hydroject 3010
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| Language | English |
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