Arm Cvl. - In secs

2.7 LOW PRESSURE CIRCUIT

A. Low Pressure Relief Valve Pressure Measurement

WARNING

¯ WHEN PERFORMING THIS TEST, DO NOT OPERATE ANY HYDRAULIC CONTROLSl ¯ ANY MOVEMENT OF HYDRAULIC CONTROLS WILL CAUSE EXTENSIVE DAMAGE TO GAUGES!

1. Perform machine preparation procedures as described in 2.1 MACHINE PREPARATION using 105kg/cm 2 (1500 psi) Pressure Gauges in al and a2 Test Ports on P1 and P2 Main

Pumps. 2. Move throttle control to "HI-IDLE," Place KPSS

Mode Switch in "H"-Mode See Figure 2.33. DO

NOT TOUCH HYDRAULIC CONTROLS. 3. Record reading from 105kg/cm ~ (1500 psi)

Pressure Gauges at al and a2 test ports on

P1 and P2 Main Pumps. Reduce engine RPM to "LO" idle. 4. Place KPSS Mode Switch in "D"-Mode and move throttle to "HI-IDLE". See Figure 2.33. DO

NOT TOUCH HYDRAULIC CONTROLS. 5. Record reading from Pressure Gauges at al and a2 test ports on P1 and P2 Main Pumps. 6. Compare readings to proper chart for specific machine being tested.

B. Low Pressure Relief Valve Pressure

Adjustment

1. Should adjustment of the Low Pressure Relief

Valves be necessary, refer to the Shop Manual for the Specific Machine being adjusted.

FIGURE 2.33

SK300 ILLUSTRATED

’--" ~} li Ii I P2 LOW PRESSURE I~ t L~ REUEFVA’VE ..........

FIGURE 2.34

NOTE

The Low Pressure Relief Valves are not adjustable externally. They are adjusted using intemal Shims.

2. The Low Pressure Relief Valves are located in the end sections of the Main Conb’ol Valve. See

Figure 2.34 for SK200~460 and Performance

Inspection Specification charts and illustraUons for specific model.

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