LIT. NO. 67477
October 1, 2002
CHEVROLET.IGMÇ
UNDER-FRAME MOUNT
. .
INSTALLATION INSTRUCTIONS
FOR SINGLE-STAGE AND
TWO-STAGE TAILGATE SPREADERS
The under-frame mount is reommended for use on the following vehicles with an 8 foot box:
1973.1987 Chevrolet I GMC CIK..io / 1500,20/2500,30/3500.
TbiSriountiSNOT applicâlJlèto .trncksequippe'withàshort(6-1Ifoot)bøx.
Read and underan InstaUaton Instructions before insaJJing the under-frame mount.
TABLE OF CONTENTS
TABLE OF CONTNTS
SAFTY ....... 1
Safety Definitions 1
Safety Procedures . 1
Battery Safety ". " . . 1
WEIGHT RESTRICTIONS. . . . . . 0 " . 0 2
UNDER-FRAME MOUNT
INSTALLATION . . . . .. . . . " . . . .
Rear Brackets Instalation . . . .
Subframe Assembly . '0 . . . . . . .
SubframeAssèmbly Installation . . . .
Secondary Frae Assenibly . " . " .
Mounting the Secondary Frame . . .
Hopper Installation. . .. . . . . . .
ABBREVIATION KEY ....""..
PARTS LIST ".. .. . . . " . . . 0 .
...'..
.....
.'.....~.
.. . . . .
Under-Frame Mount Assembly
OOevrolet / GMCMounts . . .
3
3
4
4
5
5
5
7
8
8
.. .. 10
'"
Douglas Dynamcs reserves the right under its product improvement procedures to change constrction or design detals and
furnish eqipment when so altered without reference to ilustrtions or specifications used herem.
Oct6bar112002 Printédin the U~S.A. Lit. Nö.61477
SAFETY
Safety Definitions
Read this maual and all spreader labels before
instaling or operatig the spreader.
W.. ........... ARNlNG: The
symbol at left
A identifies a SAFETY
WARING that indicates a
. ... potentily hazus sìtttion that
if not avoided, could result in death
or serious personal injury.
CAUTION; Indicates a situation that, if not
.. avoì4ed coul4 ret in cle to prOuc
or property.
.N. .. OTE: Identifies tips, .
helpful hints, and
mantenance inormation the reader should
know.
S,fety Procedures
Observe the following safety procedures before
and durg the use of the spreder. By following
these roles and applying common sense, possible
personal injury and potential damge to the
machie may be avoided.
A IWARG:
. Before stag the spreader, verify all
personnel and equipment are clear of the
spreaer spray area.
I CAUTON:
· Do not operate a spreader in need of
maitenance.
· Before operatig the spreader, reassemble
any pars or hardware removed for
cleaing or adjusting.
· Before opratig the spreader, remove
materis such as cle,ing rags, bnnshes,
and hand tools from the spreader.
Lit. No. 67477
N... OTE: If
the spreader obstrcts the view of
the license plate, check for any local
regulations that may apply.
N. .... ... .. OTE: If rear directional/brake lights are
obstrcted when mounting the spreader, the
lights must be relocated, or auxiliar directional!
brae lights must be instaled to side of spreader
brackets.
Battery Safety
A W.. ARNIG: FoBow these
....... ... wargs to avoid personal
.... . · injur an4 4amage to pr4uctor
property.
· Avoid exposing battery to a spark or
flame.
. Always charge battery in a well ventiated
area.
. Avoid contact with battery acid.
· Always disconnect battery before
removing or replacing any electrcal
components.
· Never lay anythg on a battry. This
could result in electrical shock or burs
and could cause explosions.
October 1, 2002
WEIGHT .FFESTRICTIONS
AWARNING: The use of
.. unde-frame or in-be mounts
on half-ton trcks is restrcted to
spreading only salt or calcium
chloride (ma. 70 lb. per cu. ft.).
Failure to comply could result in
exceedng the payload capacity. See
Figures 1 & 2.
AWARING: Check the
. . .. .... vehicle's loa ratig
certification sticker for maximum
vehicle capacity and DO NOT load
beyond the vehic1eGVW 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. - -----
HITCH TYPE ¡ MAX.
MAX. GROSS TONGUE WT
TRLR WT (LB.) (LB.)
WEIGHT
DISTRIBUTING
WEIGHT
CARRYING
BALL MOUNT
10,000 1000
10,000 1000
- ~~-~ -~~
950 Ib
1 0 ft3
Sand = 95 Ib/ft!
10 ft3 X 95 Ib = 950lb
Figure 1
October 1) 2002
400 Ib
1 Oft
Salt = 40 Ib/ft (Avg)
10 ft x 40 Ib = 400 Ib
Figure 2
Very Coarse =35 Iblft3
Coarse = 451b/ft3
Fine = 50 Ib/ft
When tightening faseners, refer to Table 1,
Torque Char for the recommended fastener
values.
5/16-16
3116
3124
111$-14
11213
9116-12
5/11
28
46
68
15
'15
165
225
11
19
24
30
45
66
93
18
31
46
50
75
110
150
Metrc Graqe 8.8 (Ft.-lb.
It i.
M12 GO
M14 95
2Lit. No. 67477
UNDER-FRAME MOUNTINSTALLA TION
.N. .. OTE: Remove any existing trailer hitch and
other after-market equipment which may
interfere with the installation of this product
according to these instrctions.
A WARG: Before working
. . ..... ... with th sprea, seur al
loose fitting clothing and
unrestrined hair.
N'.. . OTE: Instal all fasteners fmger tight until
assembly is complete. Then tighten
according to the Torque Chart on page 2.
Re~r Brackets Installation
1. Unplug license plate light sockets from
bumper (1 per side).
2. Support bumper and remove bolts securig
bumper mounting brackets to frame (3 per
side).
r----- .....,..'-
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,
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I REAR
l
i MOUNTING
¡ ,
I BRACKET
tt1/2-13X1-1/2n SOL T
~1/2nFLATWASHER
Figure 3
Rear Bracket Installatin
3. Remove bumper and brackets by sliding
down and back.
4. Losen bolts seurg bumper brackets to
bumper (Do not remove.).
Ut. No. 67477
Figure 4
Rear BracketlBu1lperlnstaùùon
5. Position rear subfre brackets to frame rails
and align holes. Install one 1l2ttxl-l/211 hex
he,ad capscrew,with 112'~ flat washer down
though slot in lower frame flange and mount
bracket. Secure with 1.2" locknut. Repeat for
opposite side. See Figure 3.
CAUTION: Before drling any holes,
. . .... check bo side of thè mateial for any
wires, fuel lines, fuel taks, etc. that may be
damged by drlling.
6. Using rear mount bracket as a template,
enlarge existing 3/8H hole in lower frame
flange using a 17/32" ddll (1 per side).
. 7. Insta1/2-13xl-1I2" bolt, washer, and
locknut as in step 5.
8. Instal bumper with bumper brackets outside
of rear subfninie mount brackets. Align holes
and seure using 112-13xl;.1I2" bolts and
locknuts (3 per side). See Figure 4.
3October 1, 2002
UNDER-FRAME MOUNT .,NST ALLATION
Subframe Assembly
i. Insert receiver hitch into sub frame mounts to
furest (narw) position and align holes.
2. Instal two 5/8" x 4H grade 8 bolts per side
(four tota) and washers (one on each side of
the crosstube). See Figure 5.
3. Position front brackets inside of sub frme and
retain with one 1/2" x 1-1/2" grade 5 bolt,
1I2tt flat washer and 1/2" locknut. See Figure
5.
Subframe Assembly Installation
i. Position assembled subfrae under trck
between two rear mountig brackets"
2. Instal two 1I2" x 1-1/2" grade 5 bolts, and
1/211 locknuts (per side) to hold subframe to
1"Car bniç.kçts.S(; PigUl'C 6.
3. Swing front of subfre assembly up until
front brackets are seated agaist bottom frme
flange.
CAUTION: Before dring any holes,
. check both sides of the material for any
wirs, fuel lines, fuel ta, etc. that may be
daaged by drilling.
October 1. 2002
4. Using.bracket as a.template., center punch and
dril1 two 17/32'. holes in bottom flange of
frae (2 per side). See Figure 6.
I
¡
i
¡
!
i
¡
i
i
I
I
Iíí. .""
¡ll0
i
!
I
I 1/2" LOCKNUT
I .
L._..._~.________~__
Figure 6
1/2-13X1-1/211 SOL T
1/2" I=LAT
WASHER
~~
REAR MOUNTING
BRACKET
.N.... ...ote: ?n some vehicles, hol~s exi~t in proper
location. These must be drlled out to 17/32".
5. Instal two 112ft x l-1I2n grde 5 bolts and
1/2u flat wasers (per side) with the head of
the bolts inside the fre~ Retan with 1/2"
locknut.
6. Tighten al fastener according to the Torque
Char on page 2.
7. Replace license plate light sockets into .
bumper.
4Lit. No. 67477
UNDER-FRAME MOUNT.INSTALlATION ..
Secondary Frame Assembly
1. Position center seondary frame sections
between curb and drver-side seconda
fre sections. See Under-Frame Mount
Assembly drawing on page 8.
NOTE: Secondar frame
must be assembled
, ... with mount bars to inside of vertical tubes.
Top of center section should be approximately
six inches above top of vertical tube. The notch
in the top cross..member must face reaward.
NOTE: Center secondary frame may be
... ....âSembbed ttôttlX iihesKKforuse
with higher trucks.
2. Ali~ h~i~and il1st¿isi~3/8t' x 2-1/2'lgrade
8 bblts fhougb vertcal mDes.andcenter
section sideplate. Retan with flat washer and
locknuts, three on each siçle. .
3. Tighten aU fasteners according to the Torque
Char on page 2.
Mounting the Secondary Frame
'1. Position secondar frame behind trck and
insert mount bars of secondar fre into
subfre pockets. See Figure 7.
Figure 7
Lit. No. 67477
2. Slide secón.dâr frame iritö sub frme urtìl
3/411 holes align.
3. Instal two 3/4'~ pins though subframe and
seconda frame.
4. Retan 3/4" pins by instaling 3/16" linchpin
into bole in 3/4ll pins. See Figure 8.
Figure 8
Hopper Installation
1. Lift hopper assembly and tip slightly forward.
See Figure 9.
Figue 9
'5 October 1, 2002
UNDER-FRAME MOUNT ASSEMBLY
2. Position tabs on the hopper assembly over the
top of the instaled secondary frame assembly
and lower the hopper assembly. See Figure
10.
Figure 10
3. Allow hopper assembly to rotate until the
bottom contacts secondar frae assembly .
4. Insert hold-down pins on each side and secure
with hairpin cottrs. See Figure i 1.
Figure 11
October 11 2002
5. Connect spreader-side wiring harness to
vebicle-sidewiring haress. See Figure 12.
N.... ...OTE: .
Grease the electrical connections
using dielectrc grease.
SPREADER-SIDE
WIRING HARNESS
VEHICLE-SIDE
WIRING HARNESS
-..._._~-_._--_.._--_....-._.
Figure 12
C... AUTION: Both pins nnustbein place
and
secured with hairpin cotter pins. The
hopper assembly may become unstable if the
pins are not properly secure whHe the vehicle
is in motion.
6Lít. No. 67477
ABBREVIATION KEY
ASSY
CS
CTR
CU
DR
G
HX
LK
Lit. No. 67477
Assembly
Cap Screw
Center
Curb-Side
Driver-Side
Grade
Hex
Lock
NYIS
PT
SAB
STD
TY
ZP
ZYC
WI
7
Nylon Insert
Prevailing Torque
Society of Automotive Engineers
Standard
. Type
Zinc Plate
Zinc Yellow Chromate
With
October 1 t 2002
PARTS LIST
Undér-FrameMount Assembly
2
1
..
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,..
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.."
/,." 13
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1"'-1 .... ....
12 ....................
11
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4
October 1, 2002 sLit. No. 67477
PARTS LIST
Under-Frame Mount Assembly
DESCRlON
MOUNT SUBFRAME - CD
MOUNT SUBFRA - DR
SECONDARY FR - er
SECONDARY FR
SECONDARY FRAME
RECEIVER HITCH WI LABELS
(includes item 17)
7 6 3/8-16X2-1I2 HX CS 08 ZYC
8 4 5/8-11 X4 HX eSGS ZYC
9 8 5/8 PLAI WASHER IT A SAB ZP
10 4 518-1 i PT HX LK NUT NYS zye
11 6 3/8 PLAIN WASHER TY A SID ZP
12 6 3/8-16 PT HX LKNU NYS ZYC
13 2 3/4X2-3/4 HITCH PIN zye
14 2 PIN 1/2"X5.511
15 2 LINCHPIN 3/16"
16 2 HAIRPIN COTTR 1/811
17 1 LABEL - INORMATION (WARNG)
Pars 7-15 ar found in the following assembly:
i BOLT BAG ASSY
ITEM QTY.
1 1
2 1
3 1
4 1
5 i
6 1
3N OTE: . See Owner' sManual for repair par
numbers.
Lit. No. 67477 9October 1, 2002
PARTS LIST
Chevrolet J GMC Mounts 1973-1987
SU ASBLD IN "'NA
CONlCTlO (NO HO SHNG)
ITEM QTY. DESCRIPON
1 2 BRACKET-FRONT
2 i BRACKET-REAR-CU
3 i BRACKET-REAR-DR
4 20 1l2-13Xl-1l2HXCS GSZYC
5 20 1/2..13PT HX LK NUT NYIS ZYC
6 10 1/2 PLAIN WASHE TY A STD ZYC
N. .. .OTE: See Owner's Manual for repair par
. .
numbers.
Octobér1, 2002 10 Lit. No. 67471
/
