1. Plug In line from the pump. 2. Relief valve.
Remove plug (1) from the oil line from the pump and
install the hose and gauge assembly.
Start the engine and run it at low idle rpm. Raise the
bowl as far up as it can go. Increase engine rpm, and
slowly move the bowl lift lever to the UP position for no
more than 5 seconds. The high reading on the gauge is
the pressure setting for relief valve (2). The correct
pressure setting is 2525 + 25 or -0 psi (177.5 + 1.8 or 0
kg/cm2) (17 425 + 172 or 0 kPa).
2. Relief valve. 3. Shims. 4. Valve body.
If the pressure setting of relief valve (2) was not
correct, stop the engine. Remove relief valve (2) from
the control valve and install a new relief valve.
If a new relief valve is not available, remove valve
body (4) from valve (2) and either add shims (3) to
increase or remove shims to decrease the pressure
setting of the relief valve.
After a shim is either removed or added and valve
body (4) is installed on valve (2), install the relief valve
in the control valve. Start the engine and make another
relief valve test.