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PAGE 40 — EHTX44Y RIDE-ON TROWEL • OPERATION MANUAL — REV. #0 (01/16/13)
MAINTENANCE
To access the right and left hydrostatic pump test ports,
remove the grill guard. It is best to use two gauges
simultaneously, but it is possible to use only one gauge
and repeat the procedure for each side.
Connect the pressure gauges to right and left test ports
as shown in Figure 47.
To fully test the hydrostatic system, the spiders will need
to be locked so that they cannot rotate. This can be done
by wrapping a chain around an arm on each spider, thus
chaining them together in the back of the trowel.
Once the pressure gauges are installed and the spiders
chained together, the system can be checked.
With the foot pedal in the idle position and the engine at
full speed, the pressure should be 150 to 250 psi. If the
pressure is less than 150 psi, the charge system may need
to be inspected and/ or serviced. In particular, the suction
filter and charge pump relief valve should be checked. The
suction filter may be plugged, or the relief valve may be
stuck. Either condition may cause low charge pressure.
With the engine at 50% to 70% of full speed, and spiders
chained together, slowly depress the foot pedal and read
the gauges. The pressure should get to at least 3,625 psi
(250 bar). If the pressure will not attain 3,625 psi (250
bar), the pump should be inspected and/or serviced by an
authorized service representative.
Figure 47. Hydraulic Pump Pressure Test Ports
3000
5000
bar
psi
4000
200
250
300
50
100
150
1000
2000
WIKA
3000
5000
bar
psi
4000
200
250
300
50
100
150
1000
2000
WIKA
PRESSURE GAUGE
(5,000 PSI)
PRESSURE GAUGE
(5,000 PSI)
LEFT-SIDE
HYDROSTATIC
PUMP TEST PORT
RIGHT-SIDE
HYDROSTATIC
PUMP TEST PORT
QUICK DISCONNECT
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