Dover HEIL LIBERTY TP1L-SM-0520, Service Manual

Page: 74 / 136

Issued May 2020
Body and Tailgate Copyright 2020, Heil Environmental
Printed in the U.S.A.
Body and Tailgate
68
PRESSURE ADJUSTMENT PROCEDURES
CAUTION
Prior to making any adjustments to the packer circuit, the body must be properly blocked with body props and in the
elevated position.
CAUTION
Prior to making any adjustments to the body main relief valve, block wheels of the unit and set the parking brake.
NOTICE
Hydraulic pressure above 2400 PSI will cause excessive pin wear and reduced linkage life.
The following pages detail the procedures for adjusting the packer circuits. These adjustments require two (2) persons, one
of which must be a fully trained and authorized operator.
The unit uses a tandem pump for the system operation. The large section of the pump (30 GPM @1500 engine RPM)
operates the packer, body raise and tailgate circuits. The small section of the pump (16 GPM @ 1500 engine RPM or 725
engine RPM for OIGAI systems) operates the loader functions.
Packer Pressure Switch is located on the hydraulic tank and is plumbed into the side of the packer valve. This switch is
adjustable and is set at 2000 +/ -50 PSI. To adjust the packer pressure switch setting follow these steps:
1. With the engine off, install an accurate 0-5000 PSI gauge in the quick disconnect port.
2. Lower the body main relief valve 2200 PSI +/ -50. See “Body Main Relief Adjustment” for proper procedure.
3. Lower the packer pressure switch setting to 2200 PSI by turning the adjustment switch twice.
4. With the engine running, se the Auto/Manual Packer rocker switch (on the control panel in the cab) to the manual
position. Depress the Left/Right rocker switch on the control panel to collapse a packer cylinder. The in cab buzzer
should sound when a packer cylinder is bottomed out.
5. Reset the body main relief valve to 2400 PSI.
Body Main Relief Valve is located on the packer valve. This relief can be adjusted slightly, and can be set as follows:
1. Set the Packer Auto/manual rocker switch to the manual position and depress the Left or Right Packer rocker switch
to fully collapse one of the packer cylinders.
2. Read the pressure gauge at 1500 engine RPM.
3. Remove the cap or castle nut from the relief cartridge adjusting screw.
4. Loosen the adjusting screw jam nut on the relief cartridge adjusting screw and turn the adjusting screw clockwise to
increase the pressure until the gauge reads 2400 PSI.
5. Tighten the locking nut and replace the plastic cap.