Hydraulic System 107
Hydraulic Pressures
Pressure gauges of various pressure ranges, such as 0–1000 PSI, 0–4000 PSI and 0–5000 PSI, as well
as a set of ball-end hex keys are required for adjusting the different working pressures of the truck’s
hydraulic system (see Figure 5-18).
Figure 5-18
Pressure gauge and ball-end hex key
The pressures of the various hydraulic functions of the MINIMAX™ are set up at the factory for optimal
performance. However, when you perform maintenance work on the hydraulic system of the truck,
you may need to adjust those hydraulic pressures for a number of reasons. For more information, see
Troubleshooting Guide on page 149 or Preventive Maintenance Chart on page 24.
Adjusting the Utility Section (Electric-Hydraulic Valve)
To adjust the utility section:
1. Disconnect the closed tailgate solenoid (see H in Figure 5-19).
2. Connect a 0–1000 PSI pressure gauge to the quick-connect coupler on the inlet cover (see E in
Figure 5-19).
3. Start up the engine and let it idle.
4. Turn ON the pump.
5. Press the TAILGATE DOWN switch on the control panel.
6. Adjust the generated pilot pressure to 420 ± 20 PSI.
When facing the valve, the adjustment screw is on the right side of the valve (see A in Figure
5-19).
7. Once the adjustment is made, disconnect the pressure gauge.
8. Reconnect the tailgate solenoid.
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