Service Manual User guide

FIELD TESTING PROCEDURES

To set main relief valve pressure, install a pressure gauge in the inlet line and set pressure as follows

Remove acorn nut and loosen jam nut.

Back off pilot adjustment screw and reset so that pilot adjustment screw just seats against pilot

poppet.

Run engine at normal operating speed.

Operate one plunger of the control valve at the extreme position until a pressure reading is observed.

Reset adjustment screw until desired pressure obtained.

Holding adjustment screw at this setting, tighten jam nut and install acorn nut.

Retest to check pressure setting.

NOTE: THE ABOVE SETTING WILL PRODUCE A RELATIVELY CONSTANT RELIEF VALVE SETTING ACROSS

FULL ENGINE RPM.

To set pressure on the Service Port Relief Valve, install a good pressure gauge in the line which is in com-

munication with the Service Port Relief Valve. Apply a load to reach the set pressure of the Service Port

Relief unit. Then proceed as outlined for Fig. 29 (See Above).

NOTE: THE VOID CONTROL FEATURE IS DESIGNED TO OPERATE WHENEVER THE CYLINDER PORT PRES-

SURE IS LOWER THAN THE RESERVOIR PRESSURE AND IS NOT ADJUSTABLE.

Pilot Operated - Sleeve Type Main Relief Valve

Cartridge Type - Main Relief Valve (identical in design port relief valve).

FIGURE 29

FIGURE 30