Demco 6141 User manual
HJ26141, Rev 13
12/18
5TH WHEEL HITCH
6141 13K Autoslide
Page 2 HJ26141
VERY IMPORTANT – PLEASE READ CAREFULLY
The Demco 5th Wheel Autoslide hitch comes assembled from the factory to help make the installation easier and quick-
er. The only prep work necessary is to bolt on the side plates. There are two different mounting systems for the Autoslide
hitch. It can be mounted on either the Premier/UL base rails or the UMS (Underbed Mounting System) base rails. Once
the mounting system has been determined there is a side rail kit available for either.
For the Premier/UL mounting system the 6003 adaptor side plate kit (shown below) will be used and for the UMS mount-
ing system the 6004 adaptor side plate kit will be used. Instructions to install both types are included in the carton with
the adaptor plates as well as with these instructions.
Also included with these instructions is a procedure for adjusting the king pin capture plates. This is the most critical
procedure that needs to be done in order to ensure the proper and safe use of the hitch. Please read and follow the in-
structions on how to adjust them VERY CAREFULLY. These instructions also include the procedure for replacing the slide
disc(s) if necessary (shown below). The Autoslide fifth wheel hitch comes with a limited five year warranty that covers
most parts and labor. The slide disc is warranted for a period of one year as it is considered a consumable part.
CRITICALLY IMPORTANT
Capture plates must be adjusted to the width of the trailer pin box in order for the automatic slide mechanism to oper-
ate and function properly. Failure to do so can result in improper alignment and may cause damage to the hitch and/or
trailer. It is best to measure the pin box width first and adjust the plates evenly on either side to 1/8” over the total width
of the pin box. This adjustment is made only once at time of initial hookup, or if a trailer with a different width pin box is
towed.
The Autoslide automatic sliding hitch is designed for short box trucks to give additional clearance between the truck’s
cab and the trailer during turning maneuvers. This hitch may allow 90° turns, but NOT IN EVERY CASE.
There are many variables that can influence the ability to make a full 90° turn, such as trailer width, sharp or rounded
trailer corners, truck cab profile. The placement of the trailer king pin box also has a part in determining the turning abil-
ity of the truck and trailer. It is always recommended, even with an automatic sliding hitch, that the trailer be equipped
with an extended pin box that projects out forward from the trailer.
Caution should always be exercised when using this or any hitch to ensure that the driver is aware of clearance between
the truck and trailer when executing turning maneuvers.
VERY IMPORTANT – PLEASE READ CAREFULLY
The 5th Wheel Autoslide hitch was designed for use with recreational style fifth wheel trailers with a 2” king
pin only. It is not designed or intended for commercial, industrial, or agricultural type towing applications or
similar type applications (i.e.- car trailer, flat bed, horse, etc.).
This hitch is designed for use with short box trucks that have a 5 1/2 foot box. There is no expressed or im-
plied guarantee that a full turn can or will be achieved with the Autoslide hitch.
It is designed to work with standard trailer pin boxes between 12” minimum to 14” maximum width. Optional
adapter plates are required for most suspension pin boxes.
Any use of the Autoslide hitch, other than its intended use, may void any manufacturer’s warranty(s), ex-
pressed or otherwise.
Please consult vehicle owner’s manual for 5th wheel towing instructions.
INTRODUCTION
WARRANTY POLICY, OPERATOR MANUALS, PARTS MANUALS & REGISTRATION
Go online to www.demco-products.com to review Demco warranty policies, operator manuals and register your Demco
product.
HJ26141 Page 3
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Tighten jam nuts against plate
Finger tighten jam nuts
Measure the width of the pinbox.1.
Adjust the capture plates so they are 1/8” wider than the pinbox. Example: if pin box measures 12” the capture plates2.
should measure 12-1/8”. Use center pin to measure from so the capture plates are centered on the head. Final ad-
justment may be needed.
Finger tighten the two inside jam nuts against the capture plate mount.3.
Tightening outside jam nuts against thick mounting plate.4.
INSTALLATION
BRACKET ADJUSTMENT
Because the Autoslide hitch uses capture plates to maintain the hitch head position in relation to the trailer king pin, the
trailer can only be coupled and uncoupled when it is in straight or slightly angled alignment. The Autoslide can couple
and uncouple up to a 10-15° trailer angle quite easily. Anything over this degree of angle will not allow for proper cou-
pling.
YES YES NO
COUPLING PROCEDURE
Page 4 HJ26141
AUTOSLIDE INSPECTION AND CARE
The Autoslide hitch should be inspected before each trip to in-
sure safe operation and travel.
Before each trip; check hitch for excessive movement or loose-
ness in the slide assembly, some movement is normal. Check fast-
ners and pins for tightness and presence.
Once a month or every 5,000 miles, inspect the lower guide plates
and roller for excessive wear that will effect the function of hitch,
some wear is normal. Apply multi purpose or lithium grease to the
side guide plates.
The Autoslide hitch has an outrigger or bar that is designed to
help carry and distribute the hitch and trailer weight when the
hitch is near its full travel distance. This outrigger needs to be
adjusted after the hitch has been installed at its correct height
within the truck bed. The outrigger bar and bolts need to be
loosely fitted to the end plate of the hitch that is closest to the
tailgate of the truck before the installation procedure. If the hitch
is to be mounted in the lowest setting with the UMS mounting
base rail system, install the outrigger as shown in the very bot-
tom drawing (2), using only 1 nut on the top of the bent flange
to secure the outrigger. On all other height settings, install the
outrigger as shown in the top drawing (1), using 2 nuts to adjust
and lock the bar.
Once the hitch is installed and locked into place in the truck
bed, adjust the height of the outrigger bar so that it is snug up
against the top of the truck bed and tighten both nuts to lock
into place.
Apply Grease
OPERATION
OUTRIGGER ADJUSTMENT
HJ26141 Page 5
5TH WHEEL DOUBLE PIVOT HEAD ASSEMBLY
The dampener stops the hitch head from flopping back and forth in the truck when the trailer is not hooked up. The ure-
thane compresses under load so it does not restrict the fore and aft movement when coupled.
Before attaching the hitch head to the saddle assembly the urethane dampener will need to be installed. It is included
in the bag with the bolt and nut for the hitch handle. Simply press into hole that is punched into the bottom side of the
hitch as shown below.
Note (Read carefully before installing): Handle can be posi-
tioned toward the front or the back if it is found to interfere
with the trailer in any way. Verify this before traveling.
Slide yellow gripped handle over locking bar, the handle1.
may point forward, upward or backward. **DO NOT have
pointing upward if it is found to interfere with the trailer in
any way during turning.
Fasten with 3/8” x 1 ¾” bolt and lock nut provided.2.
HANDLE ASSEMBLY INSTRUCTIONS
INSTALLTION
DO NOT install hitch handle in a position that the pin box could come in contact with or interfere with the latch of the
hitch handle when turning! If the pin box contacts the hitch handle or its latch when turning, the trailer may become
unhitched.
WARNING
Page 6 HJ26141
Each of our 5th wheel has been tested and pre-
greased at our production facility to help ensure easy
operation of your new product.
As it is a new piece of equipment with some moving
parts, a period of wearing in may be necessary to fa-
cilitate smoother operation for your new fifth wheel
hitch. The most important thing to remember is to
keep all moving parts well greased and lubricated.
Your doing this will help to ensure longer product
life.
Jaw pins can be removed and greased by removing
or unhooking jaw spring and both snap rings. Tap
the pin up from bottom. Clean pins and inspect for
wear, apply light coat of grease and reinstall pins,
snap rings and spring.
5TH WHEEL PIVOT HEAD MAINTENANCE
PROCEDURES TO CLOSE LOCKING BAR
Pull on handle with slight pressure while moving the secondary jaw to the right until the primary jaw is released. Slowly
allow the handle to retract into the 5th wheel head. Caution: Do not put hands/fingers into the lock jaw area.
Squirt WD40 or other oil into locking bar
tube, open and close locking bar several
times and wipe bar clean.
Apply a light coat of grease
between arrows.
OPERATION
HJ26141 Page 7
Place wheel chocks on both sides of trailer1.
wheels.
Lower trailer jacks to ground and extend un-2.
til load is level with truck suspension. If on soft
ground, place support under jack feet to pre-
vent trailer from settling.
Lower tailgate on truck.3.
Disconnect power cable and break away switch.4.
Remove lock pin and pull handle out. If handle5.
will not stay out, install safety pin in second han-
dle hole just outside of frame handle bushing.
Drive truck slowly away from trailer.6.
Inspect all fasteners for tightness at least every1.
2,000 miles of operation.
Inspect jaw and jaw bar for freedom of move-2.
ment and proper operation before each use.
Replace all damaged or worn parts.
Keep all moving parts of hitch well lubricated.3.
It is recommended to use grease or a 3/16”4.
maximum Teflon disc to help prevent wear on
top plate surface.
COUPLING PROCEDURE UNCOUPLING PROCEDURE
VERY IMPORTANT
MAINTENANCE INSTRUCTIONS
VERY IMPORTANT WARNINGS
Know your vehicle and trailer GVWR and CVWR.1.
DO NOT exceed capacity of hitch.
Hitch is for use with only a standard 2” king pin.2.
Safety pin MUST be fastened securely before moving vehicle and/or traveling
Ready to Couple Coupled and Locked Uncoupled
VISUALLY INSPECT JAW LOCKING MECHANISM BEFORE TRAVELING
Remove safety lock
pin if installed and
pull handle until
jaw locks open.
With handle in "Ready to Couple" position,
back-up tow vehicle to couple trailer and hitch.
Insert safety pin thru tab and hole in handle.
NOTE: Ensure safety lock pin is inserted properly.
Apply trailer brakes before jacks are raised and
wheel chocks are removed.
Place wheel chock on each side of trailer wheels.1.
Adjust trailer jacks until trailer is a height for hook up.2.
King pin plate should contact hitch approximately 1/2”
below level.
Lower tailgate of truck.3.
If hitch is in locked position, remove safety pin and pull4.
handle out to the “Ready to Couple” position.
Line truck so that the hitch will accept king pin. Back5.
truck up slowly towards trailer until king pin engages.
Hitch will lock when king pin is fully engaged.
With the trailer coupled, visually check to see if hitch is6.
completely locked by looking at the handle position, as
well as visually checking to ensure that the jaw bar has
traveled completely across the front of the king pin.
Place safety pin thru the tab and the hole in the handle.7.
This will prevent handle from opening.
Connect power cable and breakaway switch cable be-8.
tween truck and trailer.
Close and latch tailgate.9.
Apply trailer brakes and try to pull forward slowly to10.
double check that hitch is locked. Trailer should pre-
vent truck from moving.
Completely raise trailer jacks. Check for proper clear-11.
ance between truck box and trailer.
Pick up and store wheel chocks. You are now ready to12.
travel.
To uncouple, remove saftey pin,
pull handle straight out until the
jaw locks open. If jaw will not
stay open, install safety pin in
second handle hole just outside
of frame handle bushing.
OPERATION
5TH WHEEL HITCH OPERATION INSTRUCTIONS
Page 8 HJ26141
6081 Parts Breakdown
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US Pat. 9,550,398
ITEM PART # DESCRIPTION QTY
100908 BOLT, .375 NC X 1.75 HEX GR.5 1
202592 NUT, .375NC NYLON LOCK 1
303547 BOLT .313NC X 2.25 GR5 HEX 1
403701 NUT, .75 JAM 8
503787 SCREW #10NC X .50 SELF DRILLING 1
605337 SAFETY LOCK PIN ASSEMBLY 1
714315 SPRING, TENSION 1
814385 SPRING COMPRESS .105 MW 1
914594-95 JAW HOOK 1
10 14595-95 SECONDARY LATCH JAW 1
11 14735-95 MAIN JAW PIN 1
12 14736-95 SECONDARY JAW PIN 1
13 14737-95 BAR/JAW LINK 1
Please order replacement parts by PART NO. and DESCRIPTION
ITEM PART # DESCRIPTION QTY
14 14741-76 5th WHEEL DOUBLE PIVOT HEAD 1
15 14743-95 CAPTURE PLATE ASSEMBLY 2
16 14747 SCREW, .313NC X .25 SOCKET HD CAP 2
17 14749 SNAP RING EXT FOR .50 SHAFT 1
18 14750 SNAP RING EXT F/ .75 SHAFT 1
19 14865 ROLL PIN, .25 X 1.00 2
20 14867-95 LEVER ARM BAR 1
21 14869-95 LOCK BAR 1
22 15769 URETHANE BUMPER 1
23 15894 CAPTURE PLATE MOUNT 2
24 15934 HANDLE ASSEMBLY 1
25 16338 BOLT, .438NC X 1 SERR FLG HEX GR5 8
Please order replacement parts by PART NO. and DESCRIPTION
PARTS BREAKDOWN
6081 PIVOT HEAD PARTS BREAKDOWN
HJ26141 Page 9
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6141 Parts Breakdown
PARTS BREAKDOWN
6141 PARTS BREAKDOWN
ITEM PART # DESCRIPTION QTY
101254 BOLT, .50 NC X 1.50 GR.5 HEX 1
202772 NUT, .25NC LOCK NYLON INSERT 8
302961 .75NC NYLON INSERT LOCK NUT 1
405366 BOLT, .625 NC X 1.25 HEX HEAD GR.5 1
507908-95 HEAVY WASHER 1
611099 BOLT, .75 NC X 5.00 HEX HEAD GR. 8 1
711337-95 HINGE BUSHING 1
811779 SCREW, .25NC X .75 FLAT HD PHIL 8
913317 CLEVIS SPACER WASHER 1
Please order replacement parts by PART NO. and DESCRIPTION
ITEM PART # DESCRIPTION QTY
10 14219 URETHANE BUMPER 2
11 14221 LYNCH PIN, .313 1
12 14222-95 AS PIVOT PIN 1” X 9.38 1
13 14714-95 BEARING SPACER/SLEEVE 1
14 14985-95 ROLLER 1
15 15414-76 AUTOSLIDE 5.5’ BOX FRAME 1
16 15415-76 AS UPPER SLIDE ASSEMBLY 1
17 15416-76 AS LOWER GUIDE ARM ASSEMBLY 1
18 15418-95 MAIN ROLLER 1
19 15419 AS WEAR PLATE 2
20 15778-76 5th WHEEL HEAD YOKE 1
21 16235 GUIDE ROLLE BUSHING 1
22 16689 MAIN ROLLER BUSHING 1
23 6018 OUTRIGGER BAR ASSEMBLY 1
24 6081 5TH WHEEL DP HEAD F/AS 1
Please order replacement parts by PART NO. and DESCRIPTION
Page 10 HJ26141
HJ26141 Page 11
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