324
All Units
SEPTEMBER 2009 Printed in U.S.A.
COPYRIGHT 2009, Heil Environmental
Eliminate the Unloader Valve from the Circuit
With the engine OFF, remove the bypass line from the pressure block port marked bypass . Disconnect
the pressure hose or hoses sending oil to the lift and body functions. On the Rapid Rail and Pythons,
there are two pressure hoses to be capped; on the F7000 and F4000 there is one hose to be capped.
Cap and plug the tube connection for the bypass to the pump inlet. This forces all oil to the hydraulic
circuits as if the pump is on. (NOTE: Pump control switches in the cab are no longer effective.)
Restart the truck and test the functions. If the lift and packer functions return to normal operation (speed
and pressure within specifications), replace or repair the unloader assembly.
NOTE: If flow is present and the lift or packer operate only with no load, check the main relief valves for
proper adjustment and operation.
MONOBLOCK
UNLOADER VALVES
ADDITIONAL PRESSURE
PORTS ON OPPOSITE SIDE
TEST CAP
TEST PLUG
BYPASS
TO TANK
BYPASS
TO INLET
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