TM-5-2350-378-24-P

TM 5--2350--378--24&P

0016 00--31

HYDRAULIC OIL OVERHEATS -- Continued

0016 00

Figure 20. HDC Control Box

MAIN RELIEF VALVE TEST

WARNING

Before performing any hydraulic troubleshooting in bowl, move

ejector forward and disable it by disconnecting ejector cylinder from

hydraulic system. Failure to comply may result in severe injury or

death to personnel.

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 20,

item 5) on the HDC control box.

Start engine, move ejector forward.

Using LINE UP or LINE DOWN button (Figure 20, item 3), select V1 on the HDC display

(Figure 20, item 2). Close V1 on the HDC display (Figure 20, item 2) by selecting the

CHANGE POSITION button (Figure 20, item 4) on the HDC control box.

Have assistant hold EJECTOR CONTROL lever in BACK. Read transducer T--3 (13R)

and T--4 (13L) pressure valves individually on the HDC display (Figure 20, item 1).

Check main relief valves 13R and 13L as follows:

For 13R; With SPRUNG/UNSPRUNG lever in SPRUNG position, have assistant move

right--hand SUSPENSION CONTROL lever to RAISE, while at the same time holding

the EJECTOR CONTROL lever in BACK. Read transducer T--3 hydraulic pressure on

the HDC display (Figure 20, item 1). If the pressure is not within limits, adjust the main

relief valve 13R.

For 13L; Repeat steps for main relief valve 13L (pressure transducer T4) moving the

left--hand SUSPENSION CONTROL lever to RAISE while at the same time holding the

EJECTOR CONTROL lever in BACK.

Read transducer T--4 hydraulic pressure on the HDC display (Figure 20, item 1).

Using LINE UP or LINE DOWN button (Figure 20, item 3), select V1 on the HDC display

(Figure 20, item 2). Open V1 on the HDC display (Figure 20, item 2) by selecting the

CHANGE POSITION button (Figure 20, item 4) on the HDC control box.

Stop engine; relieve hydraulic pressure.

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