LIT. NO. 13760
Ocober 1, 2002
CHEVROLET IGMC
UNDER-FRAME MOUNT
INSTALLATION INSTRUCTIONS
FOR SINGLE-STAGE AND
TWO-STAGE TAILGATE SPREADERS
The under-frame mount is remmended for use on the following vehicles with an 8 foot box:-
. - 198..1996 Chevrolet I GMC ..1500 /250 /2500 HD /3500.
This mount is NOT applicabJe to trucks equippe with a short (6-1/2 foot) box.
Read and understad Installation Instructions betoreinstaIJing the under~fraß1e mount.
TABLE OF CONTENTS
TABLE OF CONTENTS
SAFETY ....... .. .. .. .. .. .. . 1
Safety Defmitions " .. " .. 1
Safety Procedures . . . .. :. 1
Battry Safety. . " . .. . . . . . 1
WEIGHT RESTRICTIONS. .. .. .. .. . . . . . 2
UNDER-FRAME MOUNT
INSTALLATION. . . .. .. . . 3
Rear Brackets Installatiön . 3
Subframe Assembly . . . . 4
Subfrme Assembly Installation" " . . 4
Secondary Frame Assembly.. . 5
Mounting the Secondary Frame 5
Hopper Installation. .. . 5
ABBREVIATION KEY ............ 7
PARTS LIST " " . . . . . " " .. .. . .. .. 8
Under-Frae Mount Assembly . 8
Chevrolet / GMC Mounts . . . . . . . . . 10
Douglas Dynamics reserves the right under its product improvement procedures to change constrction or design detals and
furnish equipment when so altered without reference to illustrations or specifications used herein.
October 1 , 2002 Printed in the U.S.A. lit. No. 13760
SAFETY
Safety Definitions
Read this manual and aU spreader labels before
installing or operating the spreader.
A. .,., -, W., . .. ARNIN ,.,G: The, symbol at left
identifies a SAFETY
WARNING that indicates a
potentially hazardous situation that,
if not avoided, could result in death
or serious personal injury.
CAUTON: Indicates a situation that, if
not
"., avoided, could result in damage to product
or propert.
N, ,., ,OTE: Identies tips, helpfui hints,and
maintenance information the reader should
know.
Safety Procedures
Observe the following safety procedures before
and durig the use of the spreader.. By following
these rules and applying common sense, possible
personal injur and potential damage to the
machine may be avoided.
A ¡WARG:
. Before startng the spreader, veriy all
personnel and equipment are clea of the
spreader spray area.
¡CAUTION:
. Do not operate a spreader in need of
maintenance.
. Before operating the spreader. reassemb1e
any pars or hardware removed for
cleaning or adjusting.
. Before operating the spreader, remove
materials such as cleaning rags, brushes,
and hand tools from the spreader.
Lit. No. 13760
.N,. OTE: If the spreader obstrcts the view of
the license plate, check for any local
regulations that may apply.
NOTE: If
rear directionallbrake lights are
,,' obstrcted when mounting the sp~ader, the
lights must be relocated, or auxiliar directional
brake lights must be instaled to side of spreader
brackets.
Battery Safety
AWARNING: Follow these
.. . warins to avoid persna
injury and damage to product or
property.
. Avoid exposing battery to a spark or
flame.
. Always charge battery in a well ventilated
area.
. A void contact with battery acid.
. Ahvays disconnect battery before
removing or replacing any electrcal
components.
. Never lay anything ana battery. This
could result in electrcal shock or burns
and could cause explosions.
Octóbêr1,2002
WEIGHT RESTRICTIONS
AWARNING; The nse of
" ", ,', " under-frame or in-bed mounts
on half-ton trcks is restrcted to
, spreading only salt or calcium
chloride (max. 70 lb. per cu. ft.).
Failure to comply could result in
exceeng the payload capacity. See
Fi~ures i & 2.
AWARG: Check the
... vehcle's load rati
certification sticker for maximum
vehicle capacity and DO NOT load
beyond the vehicle GVWR or
GA WR. Overloading could result in
an accident or damage to the vehicle.
The following table gives information regarding
the Class IV receiver hitch.
"".... ~ . . ~.._u~__
MAX. GROSS MAX.
HITCH TYPE TONGUE WT
TRLR WT (LB.) (LB.)
WEI'GHT 10,000 I1000
DISTRIBUTING
¡
!
WEIGHT I
CARRYING 10.00
I
1000
BALL MOUNT -
950 Ib
10 ft
370.51b
3.9ft3
Sand = 951b/ft3
10 ftx 951b =950 Ib
Figure J
October 1, 2002
400 Ib
10 fts
156 Ib
3.9 ft
Salt = 40 Iblft (Avg)
10 ft3 X 40 Ib = 400 lb
Figure 2
Very Coarse = 35 Iblft3
Coarse = 45 Ib/ft3
Fine = 50 Ib/ff
When tightening fastener, refer to Table I,
Torque Char for the reommended fastener
values..
5/16-18 11 18 28
3116 19 31 4$
3124 24 4$ 68
ffM4 ~ æ ~
11..13 45 75 115
9I1e.12 66 110 16$
5111 93 150 225
Metrc Grade 8.8 (Ft-Lb.)
eOI i.
M 12 60
M 14 95
2Lit. No. 13760
UNDER-FRAME MOUNT INSTAllATION
N. .. . OTE:Remove any existing trailer hitch and
otber after-market equipment which may
interfere with the installation of this product
according to these instrctions.
A WARNING: Before working
...' ,...... with th, e spreader, secure a11
loose fitting clothing and
unrestrined hair.
N...... OTE: Ins,tall all faste~ers finger tight until
assembly 1S complete. Then tighten
according to the Torque Cbar on page 2.
Rear Brackets Installalion
1. Ren10ve outboard bumper brackets by
removing two bolts from vehicle frame and
two bolts securing bracket to bumper. See
Figure 3.
Figure 3
Driver's Side Shown
2. Position rear subfrae mountig brackets to
vehicle frame and align holes.
,Position outbard bumper brackets over
sub frme mounting brackets.
Install one 1/2u x 1-3/411 grade 8 bolt and 1/2"
flat washer though the bottom hole in the
bumper bracket, subframe mounting bracket,
and vehicle frame. Retain with J/21t flat
washer and 1/2" locknut. See Figure 4.
Lit. No. 13760
Figure 4
Driver's Side Shown
3. Instal1 one 1/2" x 1-3/4" grade 8 bolt and 1I211
flat washer through upper bumper bracket
hole"thee 1/211 flat wasers (btween bumper
bracket and vehicle frame), and vehic1e
frme. Retain with a 1I2U flat ,vasher and a'
1I2u locknut. See Figure 4.
4. Insta o~e 1/2" x 2"gi:ade 5 bolt and 1/2" flat
WåshefthroughfrOIlt note iiisûbfrafe
mountig bracket and vehicle frame. Retan
with 1l2ll flat washer and 112ft locknut. See
Fìgure 4.
5. Install onginaI bumper bracket bolts in
bnmpê.r.
3October 1, 2002
UNDER-FRAME MOUNT INSTALLATION
Subframe Assembly
1. Insert receiver hitch into su bframe mounts to
furtest (narow) position and align holes.
2. InstaU two 5/811 x 4u grade 8 bolts per side
(four totaJ) and washers (one on each side of
the crosstube). See Figure 5.
Figure 5
3. Position front brackets outside of subfre
and retain with one 1/2J1 x 1-3/4" grade 5 bolt,
1I211 flat washer and 1/2" locknut. See Figure
6.
N OTE:Drver-side bracket has a notch on top
· . · facg frnt Cnside bracket has a bevel
on top facing front.
Figure 6
October 1, 2002
Subframe Assembly Installation
1. Position assembled subframe under trck
between two rear subfrme brackets.
2. Install two 1/2" x 1-3/4" grde 5 bolt, 1/2"
flat washer and 1I2ll locknut (per side) to hold
subframe to rea brackets.
3. Swing front of subframe assembly up until
front brackets ar seated against bottom frame
flange.
CAUTION: Before drlling any holes,
. " check both sides of the material for àny
wires, fuel lines, fuel tank, etc. that may be
damaged by driUing.
4. Usingbtacket asätèmplàte,cèfitetpurlch and
dril a 17/3211 bole in vertical web of frame,
one on each side.. See Figure 7. .
Figure 7
Drier~sSUle Shown
5. Instál1 one 1/2ll x 2" grade S bolt and 1/2" flat
washer (per side) with the head of the bolt
inside the web of the frame. Retan with 1/2"
flat washer and 1/2n locknut.
6. Tighten aU fasteners according to the Torque
Chart on page 2.
4Lit No. 13760
UNDER-FRAME MOUNT INSTALLATION
Secondary Frame Assembly
i. Position center secondar frame sections
between curb- and driver-side secondar
frame sections. See Under-Frame. Mount
Assembly drawing on page 8.
NOTE: Secondar frame must be assembled
. . .. with mount ba to inside of vertcal tube.
Top of center section should be approxìmately
six inches above top öf vertical tubes. The notch
in the top cross-member must face rearward.
NOTE: Center secondar fre may be
.. " '..assembled three or six inches lower for use
with higher trcks.
2. Align holes and install six 3/8" x 2..11211 grade
8 boIts through vertical tubes =and , center
aection sideplate. Retain with flat washer and
locknuts, three on each side.
3. - Tighten all fasteners according to the Torque
Chart on page 2.
Mounting the Secondary Frame
1. Position secondar frame behind trck and
insert mount bar of secondary frame into
subframe pockets. See Figure 8.
Figure 8
Lit. No. 13760
2. Slide secondar fre into subfrme until
3/411 holes align.
3. Install two 3/4" pins througb subframe and
secondar frame.
4. Retain 3/4lt pins by installing 3116" linchpin
into hole in 3/4" pins. S~ Figure 9.
Figure 9
Hopper Installation
1 & Lift hopper assembly and tip slightly forward.
See Figure 10.
Figure 10
5October 1, 2002
UNDER.FRAMEMOUNT ASSEMBLY
2. Position tabs on the hopper assembly over the
top of the installed secondar frame assembly
and lower the hopper assembly. See Figure
11.
Figure 11
3. Allow hopper assembly to rotate unti1 the
bottom contacts secondar frame assembly.
4. Insert hoJd..down pins on each side and secure
with haiin cotters. See Figure 12.
Figure 12
October 1,2002
5. Connect spreader-side wirng haress to
vehicle-side wirng haress. See Figure 13.
N... OTE: Grease the electrical connections
using dielectric grease.
VEHICLE.SIDE
WIRING HARNESS
Figure 13
C. ......AUTION: Both pins must be in place and
seèured with hairpin cotter pins. The
hopper assembly may become unstable if the
pins are not properly secure while the vehicle
is in motion.
6Lit. No. 13760
ABBREVIATION KEY
ASSY
CS
eTR
CD
DR
G
HX
LK
Lit. No. 13760
Assembly
Cap Screw
Center
Curb-Side
Driver-Side
Grade
Hex
Lok
NYIS
PP "
SAE
STD
TY
ZP
zye
7
Nylon Insert
PrevaiIing Torque
Society of Automotive Engineers
Standar
Type
Zinc Plate
Zinc Yel10w Chromate
October 1, 2002
PARTSLIST -
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Under-Frame Mount Assembly
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October 1, 2002 8
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Ut. No. 13760
PARTS LIST
Under-Frame Mount Assembly
MOUNT SUBFRE - CU
MOUN SUBFRAM - DR
SECONDARY FRAME ,. CTR,
SECONDARY FRAME
SECOND,ARY FRAME
RECEIVR HIæ WI LABELS
(includes items i 7 and 18)
7 6 3/8~ 16X2~ 112 HX CS 08 ZYC
8 4 5/8-11X4 HX CS 08 zyç
9 8 5/8 PLAIN WASHER TV A SAE ZP
i 0 4 S/8-11FT HX LK NUT NYS LYC
11 6 3/8 PLAI WASHE TY A SID ZP
126 3/8-16FT fIX LK NU NYS ZYC
13 2 3/4X2-3/4HITCHPINZYC
14 2 PIN l/2f'X.5"
15 2 LINCHIN 3/16tt
16 2 HAIRPIN COTIR l/8t1
17 i LABEL - INORMATION (W ARNJNG)
18 i LABEL - INFORMATION (RATING)
Par 7-15 are found in the following assembly:
1 BOLT BAG ASSY
ITEM QTY.
1 i
2 1
3 )
4 1
5 1
6 1
DESCRIPTON
NOTE:. See Owner's Manufor repai par
numbers. _
Lit. No. 13760 9October 11 2002
PARTS LIST
Chevrolet I GMC Mounts
3
7
i
"~
~~5
,
4
2
ITEM QTY. DESCRIPTON
i 1 MOUNTBRACKBT-6M-REAR-DR
2 i MOUNT BRACKET-GM-REAR-CU
3 I MOUN BRACKE~GM~RON~DR
4 1 MOUN BRACKET-GM-FRONT-CU
5 4 112-l3XI-3/4 HX CS G8 ZYC
6 6 1/2-13 X 1-3/4 fI CS 05 ZP
7 4 112-13 X 2HX CS G5 ZP
8 24 1/2 PLAIN WASHER TY A SID ZYC
9 i 4 1/2- i 3 PT HX LK NUT NYIS ZYC
,N.,.OTE: See Owner's Manual for repair part
numbers. _
October 1, 2002 10 Lit No. 13760
/
