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Maintenance, Figure 47. hydraulic pump pressure test ports – Multiquip EHTX44Y5 User Manual

Page 40

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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

DIAGNOSTIC FEMALE

COUPLER