32DFR114.A
4 - 7
5.
ADJUSTING THE DEPLOY AND STOW PRESSURE SETTINGS
Refer to
Figure 4-1.
Separate pressure adjustments are available for the deploy and stow motions. The two
valves used to make these adjustments are on the pump body.
a.
Apply power to ramp, then deploy ramp and remove component access cover.
b.
Verify that oil reservoir is filled.
CAUTION
Wear safety glasses. Residual pressure may be in the hydraulic system, which can spray
fluid when first loosening the fittings. Be prepared with rags to catch fluid that spills.
c.
Refer to
Figure 4-2.
Disconnect the two rotary actuator hydraulic lines that connect to the ports on
the backside of the pump body. Cap off the upper deploy port fitting and connect a suitable
pressure gauge to the lower stow port fitting.
d.
Press and hold the STOW button on the pendant and adjust the stow pressure setting valve to
1,500 psi for a 59” ramp or 1,100 psi for a 48” ramp. Loosen the lock nut on the valve and engage
the adjustment screw with a ¼” hex key wrench to adjust. Tighten lock nut after adjustment.
e.
Refer to
Figure 4-3
on the following page
.
To check the deploy pressure, cap off the lower stow
port fitting and connect the gauge to the upper deploy port.
DEPLOY PRESSURE
SETTING VALVE
STOW PRESSURE
SETTING VALVE
DEPLOY PRESSURE
PORT (TO ACTUATOR)
STOW PRESSURE
PORT (TO ACTUATOR)
FIGURE 4-1: HYDRAULIC PUMP ASSEMBLY
FIGURE 4-2: PRESSURE GAUGE CONNECTED TO STOW PORT
