32DFR114.A
4 - 6
B.
INSTALLATION GUIDELINE
Careful installation of the Ricon FoldOver ramp contributes to correct and safe operation. Use the hydraulic diagrams
in Figures 3-7, 3-8, and 3-9 and the electrical wiring diagram in Figures 3-10, 3-11, and 3-12 of Chapter III to
supplement this chapter.
1.
LOCATING MOUNTING BRACKETS ON BUS FRAME
Use a rigid fixture that substitutes for the ramp assembly when positioning ramp-mounting brackets on bus frame.
If the ramp assembly is used to position mounting brackets, verify that it is correctly located relative to the vehicle
floor, etc. Accurate positioning of brackets prevents twisting or warping of ramp frame when installing and
tightening mounting hardware. A warped frame may cause the ramp motion to be erratic. Set height of ramp
flooring surface flush to surrounding floor structure to prevent a tripping hazard.
2.
INSTALLING RAMP IN FLOOR
Trim away floor material to allow ramp assembly to drop into floor opening. The ramp perimeter trim overlaps the
floor surface, and is sealed to it with a bead of sealer or a gasket. The typical gap between the side mounting
faces and the bus structure is 1/8 inch; use shims to fill gap. Mount ramp with six grade-5 screws (included in
supplied hardware installation kit, Ricon p/n 27481). Use flat washers and locking-type nuts. Cover ramp pockets
to protect ramp until bus assembly is complete.
3.
INSTALLING VEHICLE WIRING HARNESS
Route wiring harness from vehicle ramp controls to rear of ramp. Use the supplied electrical installation kit (Ricon
p/n 22985) to connect vehicle control wiring to the ramp interface connector. See
Table 4-2
for pin layout and
signal descriptions.
Table 4-2: CONNECTOR PIN LAYOUT AND DESCRIPTION
Pin Wire color
Description
Volts/amps
1
White
Interlock common
Ground for interlock circuits
2
Red
STOW request from ramp control switch
24 volts, 5mA max draw
3
Green
Ground
Ground for ramp circuits
4
Orange
Output signal to interlock circuit, ramp not
stowed
24 volts, 5A max
5
Black
DEPLOY request from ramp control switch
24 volts, 5mA max draw
6
Blue
Main power to ramp
24 volts, 5A max
4.
ADJUSTING MAIN PRESSURE SETTING IN RAMP HYDRAULIC SYSTEM
This adjustment sets the pressure relief valve to a setting that is slightly higher than what will be needed by the
rotary actuator.
WARNING
THIS RAMP IS DRIVEN WITH HYDRAULIC PRESSURE GENERATED BY A
HYDRAULIC PUMP SYSTEM. THE FLUID IS HIGHLY PRESSURIZED AND POSSIBLY
VERY HOT. USE EXTREME CAUTION WHEN ADJUSTING HYDRAULIC PRESSURE.
DO NOT DISCONNECT HOSES OR FITTINGS WHEN RAMP IS POWERED.
a.
Close both flow control valves (C1 and C2) by loosening the lock screws that secure their knobs,
and then rotating both knobs fully CW.
b.
Disconnect hydraulic line at port A (DEPLOY port) of hydraulic pump.
c.
Connect pressure test gauge to port A of hydraulic pump.
d.
Locate pressure relief valve on hydraulic pump, and loosen its lock nut. Engage adjustment screw
with a ¼” hex key wrench.
e.
Hold ramp control switch in DEPLOY position. Note that ramp does not move because flow
control valve has been disconnected.
f.
Adjust pressure to 1,400 PSI. Rotate adjustment screw CW to increase pressure or CW to
decrease pressure. Retighten pressure relief valve lock nut.
g.
Disconnect pressure gauge from hydraulic pump.
h.
Reconnect hydraulic line to port A of hydraulic pump.
i.
Reset both flow control valves as shown in paragraph 5 on following page.
