Saf-holland XL-AR363-02 EDL/ARF Feature Manuel d'utilisateur télécharger pdf (Page 7)

XL-AR363-02 Rev. D 7

OPERATION continued

Purpose:

he ARF (Automatic Reset Feature) is designed to ensure that the

External Dock Lock (EDL) flipper plates will not be trapped down

(engaged position) while the trailer is in motion. This is accomplished

by the use of two additional system valves.

OTE:

efer to (

IGURE 13

)

for component locations in the

EDL/ARF system.

Function:

Because both vehicle motion and position of the flipper plates must be

monitored, two additional system valves are used along with the height

control valve. A pilot valve monitors emergency brake pressure to

determine if the vehicle is parked or in motion. An auto reset (sensor)

alve monitors the position of the flipper plates (up or down) on the

External Dock Lock (EDL).

FIGURE 13

EDL/ARF System

Piping Diagram

(Numbers correspond

to the Parts List below)

7 EDL Actuator

EDL Flipper Plate Rod Assembly

shown in engaged (down) position.

/4˝±

/8˝

(120.65±

3.18mm)

Must use

Nylok

1/4˝-20 nut

(2 places)

11 Linkage

ssembly

From emergency

brake line

IMPORTANT: The sensor valve is not interchangeable with

the HCV.

Tab

Parts List

1. EDL Flipper Plate (Shown in the Engaged Position):

The flipper plates are activated by the vehicle’s emergency parking

brakes. When the parking brakes are engaged, the flipper plates

rotate down to the engaged position. When the parking brakes are

eleased, the f

lipper plates rotate up to the disengaged position.

2. Primary Height Control Valve (1/4˝ and 3/8˝ air lines):

he Primar

y Height Control Valve must always be properly

adjusted to suspension design ride height to assure proper air

suspension and EDL function. When the flipper plates are up, the

primar

y height control v

alve has full function.

3. Pilot Valve: A pilot valve is used to monitor emergency brake

pressure to determine if the trailer is parked or in motion.

Auto Reset (Sensor) Valve:

An auto r

eset (sensor) valv

e is

used to monitor the position of

the EDL f

lipper plates (either up

or down). (To distinguish between a sensor valve and an HCV, a

sticker is placed on the sensor valve.) When the flipper plates are

in the up position, the standard height control valve maintains the

predetermined ride height. The auto reset (sensor) valve arm

should only be in the “up” position when the flipper plate is

down, or “down” when the flipper plate is in the up position.

Anytime this valve is in the neutral position it will cause the air

system to malfunction.

5. One-Way Check Valve (1/4˝ and 3/8˝ air lines): Installed

to the middle por

t of

the sensor valve.

6. Pressure Protection Valve: Air pressure protection valve

ensures that safe air brake pressure is always maintained (70

psig—4.8 bars) in the air reservoir.

7. EDL Actuator: Push rod retracts (with emergency brakes on) to

pull flipper plates down (engaged).

8. Air Reservoir: Main vehicle air supply.

9. Air Spring: When the emergency brakes are released, air is

supplied to the air springs, raising the trailer above ride height.

This frees the trapped flipper plates on the trailing arm load pads.

he f

lipper plates will then rotate up and out of the way. The

rotation upward of the flipper plates, rotates the arm of the

sensor valve downward. This disengages the sensor valve and

allo

ws the primary height contr

ol v

alv

e to contr

ol all air flow for

ride height.

10. Choke Valve: Can be installed in either side of the air

suppl

y line to the actuator. Purpose of choke valve is to slow

down flipper plate rotation.

11. Auto Reset (Sensor) Valve Linkage Assembly:

Predetermine length of 4 3/4˝±1/8˝ (120.65±3.18mm) ensures

proper function of system. Linkage fasteners must be assembled

as sho

wn a

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

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Saf-holland XL-AR363-02 EDL/ARF Feature Manuel d'utilisateur Page 7

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