SAF XL-AR363-02 User Manual
EDL/ARF
OPERATION
INFORMATION
EDL/ARF Feature
External Dock Lock (EDL)
Automatic Reset Feature (ARF)
for Trailer Air-Ride Suspensions
XL-AR363-02 Rev. D
TABLE OF CONTENTS
Introduction..................................................................................................2
Warranty........................................................................................................2
Notes, Cautions, and Warnings .................................................................2
Table of Contents .......................................................................................2
xternal Dock Lock (EDL) Installation..................................................3
E
Suspension Ride Height Verification...............................................3
EDL Rod Flipper Plate Installation ................................................4
EDL Actuator Chamber Installation ..............................................4
ir System Connection......................................................................5
A
Operation......................................................................................................6
Automatic Reset Feature (ARF).......................................................6
Purpose:................................................................................................7
Function:..............................................................................................7
INTRODUCTION
This manual provides you information necessary for the installation,
adjustment, inspection, and safe operation of SAF-HOLLAND
External Dock Lock (EDL) Automatic Reset Feature (ARF) for
Trailer Air-Ride Suspensions.
The SAF-HOLLAND EDL is designed and engineered to provide
trouble-free service. In the event of an inoperative EDL, such as a bent
rod assembly or a damaged cam bracket, the vehicle should be driven
CAUTIOUSLY at slow speed, to the nearest service facility for repair
or replacement.
This EDL/ARF uses air drawn from the truck/tractor air system to
operate the EDL actuator. The height control valve regulates the air
pressure required for varying loads. The ARF feature ensures the
flipper plate(s) will not be trapped down (engaged position) while the
trailer is in motion.
WARRANTY
Refer to the complete warranty for the country in which the product
ranty is included with the product
will be used.
as well as in the suspension catalogs and the SAF-HOLLAND Web
Site (www.safholland.us). It may also be ordered by calling
1-888-396-6501.
A copy of
the written w
ar
Parts List ..............................................................................................7
Disengaged Application ....................................................................8
Engaged Application..........................................................................8
ARF Description when Releasing Trapped
Flipper Plates..............................................................................9
aintenance................................................................................................10
M
Auto Reset (Sensor) Valve Performance Check..........................10
EDL Flipper Plate Adjustment......................................................11
Primary Height Control Valve Information ................................12
Pilot Valve Check for EDL/ARF System....................................12
rimary Height Control Valve Adjustment..................................13
P
EDL/ARF System Troubleshooting......................................................14
NOTES, CAUTIONS, AND WARNINGS
You must read and understand all of the safety procedures presented in
this manual before starting any work on the suspension.
Proper tools must be used to perform the maintenance and repair
procedures described in this manual. Many of these procedures require
special tools.
Failure to use the proper equipment could result in
personal injury and/or damage to the suspension.
Safety glasses must be worn at all times when performing the
procedures covered in this manual.
Throughout this manual, you will notice the terms “NOTE,”
“IMPORTANT,” “CAUTION” and “WARNING” followed by
important product information. So that you may better understand the
manual, those terms are as follows:
NOTE: Includes additional information to enable accurate and
easy performance of procedures.
IMPORTANT: Includes additional information that
if not followed could lead to hindered
product performance.
Used without the safety alert symbol,
indicates a potentially hazardous situation
hich, if not avoided, may result in
w
.
e
operty dama
pr
Indicates a potentially hazardous situation
h, if not a
hic
w
moderate injury.
Indica
which, if not avoided, could result in death or
serious injury.
g
oided, may result in minor or
v
tes a potentiall
y hazar
dous situa
XL-AR363-02 Rev. D2
tion
EXTERNAL DOCK LOCK (EDL) INSTALLATION
FIGURE 1
EDL Components
1
3
9
4
3
2
ITEM
NO. DESCRIPTION NS-xxx-16.0* NS-xxx-16.5* NS-xxx-17.0* NS-xxx-18.0* QTY.
1 EDL Rod Assembly 42˝ - 90546178 42˝ - 90546270 42˝ - 90546136 42˝ - 90546138 1
48˝ - 90546177 48˝ - 90546269 48˝ - 90546132 48˝ - 90546134
2 Hex Bolt 38 -16 x 1˝ 93002571 93400471 93400471 93400471 4
3 EDL Rod Support Plate 90034494 90034494 90034494 90034494 2
4 Hex Lock Nut 3/8˝ - 16 93400472 93400472 93400472 93400472 4
5 Hex Nut .50-13 93400136 93400136 93400136 93400136 2
6 Washer .53 93600072 93600072 93600072 93600072 2
7 EDL Actuator Chamber 90546122 90546122 90546122 90546122 1
8 Choke Valve 90054811 90054811 90054811 90054811 1
1
9
/2˝
Clevis Assembly w/1/2˝ Pin
* “xxx” denotes models 400 or 450.
IMPORTANT: Be certain the correct EDL assembly for the
11M018-8 11M018-8 11M018-8 11M018-8 1
NOTE: Example: NS-400/450-4818, last two digits
suspension ride height is being installed. Various
5
6
8
represent 18˝ (457mm) ride height.
7
suspension ride heights require different
assemblies with different flip plate heights. If
unsure of ride height, see
FIGURE 3 and Table 1
or call SAF-HOLLAND Customer Service at
1-888-396-6501.
Suspension Ride Height Verification
1. Verify ride height by checking serial number tag located on the rear
crossmember (
If the serial number tag is not legible or unavailable, verify ride height
FIGURE 2).
2. Compare ride height to corresponding Flipper Plate Height from
Table 1 below (FIGURE 3).
TABLE 1.
Model No. Height Height
NS-400/450-16 16˝ (406mm) 6.5˝ (165mm)
NS-400/450-16.5
NS-400/450-17 17˝ (432mm) 7.5˝ (191mm)
NS-400/450-18
Ride Flipper Plate
16.5˝ (419mm) 7.0˝ (178mm)
18˝ (457mm)
“A”
8.5˝ (216mm)
by measuring from the center of the axle to the bottom of the frame
or slider (
FIGURE 2
FIGURE 3).
FIGURE 3
Flipper Plate
Serial Tag Location
Serial Number T
on Rear Crossmember
ag Located
Flipper Plate Height
“A”
Ride
Height
XL-AR363-02 Rev. D 3
5/8˝ (16mm)
Min.
Clearance
EXTERNAL DOCK LOCK (EDL) INSTALLATION continued
EDL Rod Flipper Plate Installation
. Attach one support plate to frame rail above rear axle, and secure
1
with two bolts and nuts.
FIGURE 4
EDL Rod Support Plate
EDL Rod Support Plate
Bolts
2. Slide one end of EDL Rod Assembly into the hole of the attached
support plate. Then slide the other support plate onto the opposite
end of EDL Rod Assembly and secure with two bolts and nuts.
Tighten and torque all four bolts and nuts to 25 ft. lbs. (34 Nm)
FIGURE 5).
(
FIGURE 5
EDL Installation
DO NOT tighten (FIGURE 4).
Nuts
IMPORTANT: EDL Rod/Flipper Plate Assembly should rotate
reely without binding (
f
IGURE 6).
F
FIGURE 6
Flipper Plate Installation
IMPORTANT:
EDL Flipper Plate
Assembly should
otate fully without
r
binding
IMPORTANT:
Flipper Plate must
be completely down
when attaching
actuator push rod
5/8˝ Min. (16mm)
Clearance Gap Required
IMPORTANT: Both flipper plates must rest on equalizing beam
when trailer is loaded.
EDL Actuator Chamber Installation
1. Attach actuator chamber to mounting bracket on slider box
crossmember (
Torque nuts to 50-60 ft. lbs. (68-81 Nm).
FIGURE 7
Actuator Chamber Installation
FIGURE 7). Fasten with two lock washers and nuts.
Bolts
Support Plate
Nuts
Flipper Plate
Tab
Cam Bracket
EDL Rod Assembly
Nut
Lockwasher
Actuator
Chamber
To air supply line
Actuator Chamber
Mounting Bracket
Install the adjusting nut and c
2.
vis to the actua
le
tor push rod and
thread adjusting nut and clevis down the push rod. Be sure to leave
clevis 1/2˝ (13mm) short of cam mounting hole (
FIGURE 8).
continued
XL-AR363-02 Rev. D4
EXTERNAL DOCK LOCK (EDL) INSTALLATION continued
3. Pull actuator push rod out (arrow A) so the hole in the cam aligns
ith the clevis hole (this creates tension on the actuator spring to help
w
keep the flipper plate completely down). Install clevis pin and secure
with cotter pin (
FIGURE 8).
FIGURE 8
Clevis Installation
IMPORTANT: Flipper Plate must be completely down when
attaching actuator push rod.
Cam
Cotter
Pin
Clevis
Adjusting
Jam Nut
Clevis
Pin
Push
Rod
Air System Connection
. The control for releasing the EDL is the same for releasing the
1
emergency brakes on the trailer. Locate a trailer supply line (usually
red) at the point it enters the spring brake valve (supply port).
. Replace straight connector fitting with a tee and reconnect the
2
upply line and add a length of plastic line for connection to the
s
actuator chamber (
connects the cylinder port of the pilot valve to the bottom port of
the sensor valve (
FIGURE 9
Connect Air System
To supply line
connection on
sensor valve
FIGURE 9) and the line that you will install which
FIGURE 10).
Actuator
Chamber
Choke Valve
Air Line Fitting
Cam
Bracket
Adjust clevis and jam nut on
push rod so clevis mounting hole
is 1/2˝ (13mm) short of cam
mounting hole to cause tension
on actuator return spring
Adjusting Jam Nut
“A”
Cam Mounting Hole
Clevis Mounting Hole
IMPORT
ANT:
Adjust the push r
is completel
y do
wn (
Actuator Push Rod
3/16˝ (4.76mm)
Maximum actuator
push rod protrusion
od length to assure f
FIGURE 6).
lipper plate
IMPORTANT: EDL Rod/Flipper Plate Assembly should rotate
y without binding after attaching actuator
eel
fr
od (
push r
FIGURE 6).
3. At the threaded end of the 1/4 N.P.T. tube fitting insert the choke
valve (supplied) and install fitting to actuator. Attach the supply line
from the brake valve to a 1/4 N.P.T. tube fitting (FIGURE 9).
NOTE: It may be necessary to use a vise to press choke valve
into tube fitting or use a hammer and gently tap choke
valve into tube fitting.
4. Insert the 1/4 N.P.T. tube fitting into the brake actuator inlet port
FIGURE 9).
(
NOTE: Choke valve should be flush with bottom of
the fitting.
5. From the pressure protection valve, run a line to the bottom port of
the primary height contr
ol valve (
FIGURE 12).
6. Connect the top port of the primary height control valve to the
center port of the sensor valve (
the primary height control valve and sensor
he center por
T
7.
v
alve are connected to the air springs (
ts of
FIGURE 11).
FIGURE 11).
8. The pilot port of the pilot valve is connected to the emergency line
(
FIGURE 12).
Secur
e all suppl
y lines and check for air leaks.
IMPORTANT: It is the responsibility of the air system installer
to secure all air lines and check for any air leaks.
If air leaks are detected, repair as required.
ailure to eliminate the air leaks may compromise
F
.
mance
the suspension perf
or
XL-AR363-02 Rev. D 5