Pro Series 51016 User Manual
SERIES 51®
Installation Instructions
Chevrolet Pickup, Dodge Pickup,
Ford F-100, F-150, F-250, F-350,
Part Numbers:
51016
Equipment Required: Center punch, Clamps,
Files-Round & Flat
Fastener Kit: 51016-051
Wrenches: 3/4, 13/16, 7/8, 13mm, 18mm, 19mm
Drill Bits: 3/16(.187), 9/32(281), 1/2(.500), 17/32(.531)
Side bracket
Cross Tube Assembly
DO NOT
GMC Pickup
Hitch type
Weight Distributing
Weight Carrying
Ball Mount
Rivet clearance for 1988 to present
Chevy Pickups only. Other models use
spacers to space down for rivet clearance.
install upside down
Do Not Exceed Lower of Towing Vehicle
Side bracket
Manufacturer’s Rating or
Max Gross
Trailer WT (LB)
3
3
Cross Tube Assembly
DO NOT
install upside down
Max Tongue
WT (LB)
1000 (454 Kg)10,000 (4540 Kg)
500 (227 Kg)5000 (2270 Kg)
1
2
1
2
3
Bolt 1/2-20 X 1.50Qty. (6)
Hardened Flat WasherQty. (8)
Flanged Locknut 1/2-20Qty. (6)
4
5
6
7
1. Remove pickup truck spare tire at end of frame from its under bed mounting. This is not required for each installation but will make receiver
installation easier. It is to be reinstalled when installation is complete.
2. Measure the outside width of the frame. It should measure approximately 34" or 37-1/2" or 38".
3. Assemble the side brackets to the crosstube assembly as shown above. The bracket flanges point outboard for 37-1/2" and 38" wide frames.
The bracket flanges point inboard for 34" wide frames. Slots in the crosstube must line up with the holes in the side brackets. (Caution: Do Not
drill new holes in any receiver part.)
4. Install the 1/2-20 x 1-1/2 hex bolts, hardened flat washers, and flange locknuts as shown above. Do not substitute regular nuts for the
locknuts. Tighten all 1/2-20 fasteners with torque wrench to 90 Lb.-Ft. (122 N*M)
5. Read the General Notes and then continue installation by following the instructions for your particular vehicle application which is
listed on the following pages.
Note: check hitch frequently, making sure all fasteners and ball are properly tightened. If hitch is removed, plug all holes in trunk pan or other body panels to
prevent entry of water and exhaust fumes. A hitch or ball which has been damaged should be removed and replaced. Observe safety precautions when working
beneath a vehicle and wear eye protection. Do not cut access or attachment holes with a torch.
This product complies with safety specifications and requirements for connecting devices and towing systems of the state of New York, V.E.S.C. Regulation V-5
and SAE J684.
Hex Nut 1/2-13Qty. (6)
Tighten all 1/2-20 GR5 fasteners with torque wrench to 90 Lb.-Ft. (122 N*M)
Tighten all 1/2-13 GR5 fasteners with torque wrench to 75 Lb.-Ft. (102 N*M)
Tighten all M12 CL10.9 fasteners with torque wrench to 75 Lb.-Ft. (102 N*M)
8
9
11
12
13
Spacer 1/4 X 1.00 X 2.00Qty. (4)
Bolt M12 X 1.75 X 45Qty. (2)
Spacer 7/16 X 1.00 X 2.00Qty. (2)
Nut M12 X 1.75Qty. (2)Bolt 1/2-13 X 2.00Qty. (4)
Lock Washer 1/2Qty. (2)Spacer 1/4 X 1.50 X 2.00Qty. (12)
Bolt 1/2-13 X 2.25Qty. (2)Conical Washer 1/2Qty. (6)
z 2001, 2006 Cequent Towing Products
Rev. A6-27-06N51016Sheet 1 of 5
Form: F205 Rev A 5-6-05
Chevrolet & GMC Pickup Trucks with 34" frames
(Does not fit units with 6' bed or 4WD with heavy duty suspension )
1. Tighten the 1/2-20 hex bolts installed as shown
on page 1 to 90 lb.-Ft. (122 N*M)
2. Note:
3. Position and center the receiver assembly on vehicle
4. Using the slots in the side brackets as templates, center punch
5.Install fasteners in each side as shown.
1981 and later Chevrolet & GMC applications
with step bumpers require the removal of support
brackets to the frame. These brackets must be
retained for reinstallation upon removal of the receiver.
The step bumper should not be used for towing with
these support brackets removed.
frame. Rearmost slot in receiver should not be located
closer than 3/4" from the end of the frame. To clear
rivets in the frame, place a spacer between side brackets
and vehicle frame at each attachment. Clamp receiver
to the frame. Note:
in place, the top of the rivets may have to be ground or
filed off to ensure that the attaching surfaces sit flat on the frame.
and drill six (6) 1/2" diameter holes. See General Notes regarding
the use of existing holes.
On some units even with the spacers
Crossmember
and rivets
5
6
7
4
5
9
2
8
5
6
11
Part Numbers:
51016
4
8
Spacers required to space
receiver down to clear rivets.
5
Top of rivets may have to be
filed to ensure spacers sit
flat to frame and receiver.
1
2
3
Bolt 1/2-20 X 1.50Qty. (6)
Harden Flat WasherQty. (8)
Flanged Locknut 1/2-20Qty. (6)
4
5
6
7
1988 & Later Model Chevrolet & GMC Pickup Trucks with 37-1/2" frames
Note:
On units equipped with an extended cab and 6' bed, the
spare tire will have to be relocated elsewhere on the vehicle.
1. On 6' bed units, remove and relocate ground wire and ground
wire bolt located on driver's side frame rail.
2. If vehicle is equipped with factory installed step bumper,
remove the M12 hex bolts from each end of the frame and discard.
3. Raise receiver into position, centering rearmost slot over existing
holes in frame. On units with a 6' bed, the large 1" x 2" slot will be
positioned over a bolt on the passenger's side and a rivet on the driver's side.
4. Vehicles w/factory installed step bumper:
bolt and conical washer through side bracket into frame, threading into
existing weldnut as shown.
5. Vehicles W/O factory installed step bumper:
Install M12 x 1.75 x 45mm hex bolt and conical washer through side
bracket and frame and fasten with block, lock washer and M12 x 1.75 nut.
6. Center receiver crosstube assembly on vehicle and tighten the 1/2-20
hex bolts installed as shown on page 1 to 90 lb.-Ft.(122 N*M).
7. Due to vehicle variation, center attachment hole in frame may have to be
enlarged to 1/2". See General Notes regarding use of existing holes.
8. Install fasteners in center and forward holes on each side as shown.
Note: check hitch frequently, making sure all fasteners and ball are properly tightened. If hitch is removed, plug all holes in trunk pan or other body panels to
prevent entry of water and exhaust fumes. A hitch or ball which has been damaged should be removed and replaced. Observe safety precautions when working
beneath a vehicle and wear eye protection. Do not cut access or attachment holes with a torch.
This product complies with safety specifications and requirements for connecting devices and towing systems of the state of New York, V.E.S.C. Regulation V-5
and SAE J684.
Hex Nut 1/2-13Qty. (6)
Install M12 x 1.75 x 45mm hex
Tighten all 1/2-20 GR5 fasteners with torque wrench to 90 Lb.-Ft. (122 N*M)
Tighten all 1/2-13 GR5 fasteners with torque wrench to 75 Lb.-Ft. (102 N*M)
Tighten all M12 CL10.9 fasteners with torque wrench to 75 Lb.-Ft. (102 N*M)
8
9
11
12
13
Spacer 1/4 X 1.00 X 2.00Qty. (4)
Bolt M12 X 1.75 X 45Qty. (2)
Spacer 7/16 X 1.00 X 2.00Qty. (2)
Nut M12 X 1.75Qty. (2)Bolt 1/2-13 X 2.00Qty. (4)
Lock Washer 1/2Qty. (2)Spacer 1/4 X 1.50 X 2.00Qty. (12)
Bolt 1/2-13 X 2.25Qty. (2)Conical Washer ½Qty. (6)
4
5
Rivets
Crossmember
and rivets
6
7
Existing hole.
4
5
6
7
Without Bumper
use:
11
12
5
Existing weldnut
for units with
factory installed
step bumpers
With Bumper
use
6
9
z 2001, 2006 Cequent Towing Products
Rev. A6-27-06N51016Sheet 2 of 5
Form: F205 Rev A 5-6-05
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