Issued July 2024
Maintenance and Adjustment
Copyright 2024, The Heil Co.
Printed in the U.S.A.
Maintenance and Adjustment
90
PRESSURE ADJUSTMENTS (CONTINUED)
D.Packer Pressure Switch (Continued)
7. For Operate-In-Gear-At-Idle units, start the engine, leave it idling and place the transmission in neutral. Set the parking
brake.
8. Deadhead the packer fully extended.
9. Increase the pressure switch setting until the test light stays on.
10.Decrease the pressure switch setting until the test light goes off. Decrease the pressure switch approximately 1/8 turn
every two seconds.
11.Return the main relief to 2500 psi.
It is very import to make pressure changes slowly. Quick changes can result in mistakes.
E.Verify Pressure Switch Setting
1. Install the 0-5000 PSI pressure gauge in the fitting on the inlet section.
2. Install a test harness between the pressure switch and the body harness.
3. The hydraulic oil must be at or near operating temperature. If not, warm the oil.
4. Remove any dirt around the main relief valve.
5. Lower the main relief to 2000 psi +/- 10 psi using the tailgate lock function.
6. Disconnect the full extend packer proximity switch.
7. For Operate-In-Gear-At-Idle units, start the engine, leave it idling and place the transmission in neutral. Set the parking
brake.
8. Deadhead the packer fully extended.
9. Slowly increase the main relief by small increments (1/16 – 1/8 turns). Pause for at least three (3) seconds between
increments. Increase the main relief until the test light goes out.
10.Note the main relief pressure setting. This is the value of the pressure switch setting.
11.Return the main relief to 2500 psi.
F. Lift Control Valve
Refer to Lift Control Valve Pressure Adjustments in the Lift Arm section.
G.Body Control Valve
Body Valve Pump 1
The following procedure will show pressure from Pump 1 only, having a power beyond system on the Python, the lift
valve is daisy chained with the body valve. The lift main relief is normally set at 2300 PSI.
Following the below procedure will show 2300 PSI and turn the body valve relief valve adjustment screw will not change
the pressure.
1. Install 5000 psi pressure gauge on body valve quick-disconnect.
2. Activate and hold tailgate lock air toggle.
3. Verify pressure on gauge reads 2500 psi.
4. If pressure reading is incorrect, using an open end wrench, remove caste nut on main relief.
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