Multiquip HTX44Y5 - Manual (Page 41)

HTX-YANMAR DIESEL • RIDE-ON POWER TROWEL — OPERATION MANUAL — REV. #0 (07/06/06) — PAGE 41
/02) — PAGE 41
Figure 41. Pressure Gauge (Hydraulic Pump)
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.
Many hydraulic problems are a result of low fluid levels. Before
checking any other possibilities, make sure the hydraulic fluid
level is up to the top of the sight glass which is located at the
back/center of the frame.
Hydrostatic pressure can be checked using a pressure gauge
with a range of at least 5,000 psi. Two male diagnostic quick
couplers (one for each pump) are located beneath the right grill
guard. To access couplers, (Figure 42), remove the grill guard. It
is best to use two gauges simultaneously (Figure 41), but it is
possible to use only one gauge and repeat the procedure for
each side.
HTX-YANMAR DIESEL — MAINTENANCE
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.
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
1
1
2
3
4
1. Pressure Guage - 5,000 PSI Range
2. Parker Hannifin Quick Disconnect PD-Series Diagnostic Female Coupler
3. Right Side Hydrostatic Pump Test Port
4. Left Side Hydrostatic Pump Test Port
NEVER use your hand to find hydraulic
leaks. Use a piece of wood or cardboard.
Hydraulic fluid injected into the skin must
be treated by a knowledgable physician
immediately or severe injury or death can
occur.
Checking Hydraulic Pressure 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.
WARNING WARNING WARNING WARNING WARNING