HYDRAULIC AND AIR SYSTEMS 2250 SERVICE/MAINTENANCE MANUAL
2-18
Published 07-19-16, Control # 249-01
Initial Startup
The following procedure requires two people—one to start
the engine and monitor pressures on the diagnostic screens
and one to monitor the bleed lines and close the bleed
valves.
1. Calibrate the pressure senders as described in
Calibrating the Pressure Sender on page 2-10
.
2. Open the shut-off valve in the pump suction line
(Figure 2-22
). Pumps can be damaged from cavitation if
this step is not performed.
3. Connect the bleed lines equipped with shut-off valves to
the gauge coupler at each pressure sender. The
pressure senders can be seen in Figure 2-16
.
4. Open the shut-off valve in each bleed line. Use a
suitable container to catch oil.
5. Remove the adjusting screw from the fan and pilot
pressure relief valves (Figure 2-21
and Figure 2-23).
Then reinstall the screws approximately 6 mm (1/4 in)
and securely tighten the lock nuts. Serious damage can
occur to system components if this step is not performed
before starting the engine for the first time.
6. With all controls off, start and run the engine at its lowest
possible speed.
7. Have one person bleed the pressure senders while a
second person checks the pressures.
8. Bleed the pressure senders as follows:
a. Observe oil flowing from the bleed line at each
pressure sender. The pressure senders can be
seen in Figure 2-16
.
b. Close each bleed valve when a clear, steady stream
of oil appears (no air bubbles in the oil).
c. If oil does not flow from any bleed line, determine
the cause and correct it.
FIGURE 2-21
Fan Bypass Valve (optional)
P970
P971
Electric Plug
Fan Relief
Valve
Adjusting Screw
(with lock nut and protective cap)
Fan Relief Valve
3,2 mm (1/8 in) Gauge Coupler
(with protective cap)
Access at Left End of Radiator
FIGURE 2-22
To Hydraulic Tank
P779
Shut-off Valve Handle Open
(pull toward you to close)
Install Bolt and Nut or Padlock To
Lock Handle Open
To P u mp s
Access at Rear Inboard Side of Rotating Bed
(above fuel tank)
FIGURE 2-23
Adjusting Screw (with lock
nut and protective cap)
P972
3,2 mm (1/8 in)
Gauge Coupler
(with protective
cap)
Access at Right End of Radiator
Pilot Pressure
Relief Valve
To Next Page
Loading...
