curt 17510 User manual

CURTMFG.COM •PRODUCT SUPPORT: 877.287.8634 •17510-INS-RA •02/08/2023 •ECN10468 •PAGE 1
Product Registration and Warranty
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To get copies of the product warranties, register your purchase
or provide feedback, visit: warranty.curtgroup.com/surveys
Max Capacity Without Spring Bars
Gross trailer weight (GTW) 10,000 lbs.
Tongue weight (TW) 800 lbs.
When spring bars are not used, the weight
rating is dependent upon the trailer ball
manufacturer's weight ratings. Do not exceed
the maximum weight rating of the trailer ball.
Max Capacity With Spring Bars
Gross trailer weight 8,000 - 10,000 lbs.
Tongue weight 800 - 1,000 lbs.
The tongue weight rating of the spring bars
represents the capacity of a pair of bars, not
an individual bar. Always use a pair of spring
bars and be sure they are rated the same.
INSTALLATION MANUAL 17510
Tools Required
Ratchet Socket set
Torque wrench Tape measure
Level of Difficulty
Moderate
Installation difficulty levels are based on time
and effort involved and may vary depending on
the installer level of expertise, condition of the
vehicle and proper tools and equipment.
NOTICE
Visit www.curtmfg.com for a full-color copy of this
instruction manual, as well as helpful videos, guides and much more!
Before you begin installation, read all instructions thoroughly.
Proper tools will improve the quality of installation and reduce the time required.
Some states require a clear view of license plates.
Remove trailer ball when not in use if it restricts view.
This product complies with regulation V-5, C.S.A. Standard D-264 and safety
requirements for connecting devices and towing systems of the State of New York.
Periodic inspection of your product should be performed
to ensure all hardware and / or components remain secure.
To help prevent damage to the product or vehicle, refer to the specified
torque specifications when securing hardware during the installation process.
WARNING
Never exceed the vehicle manufacturer's recommended towing capacity.
The loaded ball height should never be greater than the uncoupled ball height. Front wheel overload
and loss of rear wheel traction can result and can lead to unstable handling. It can reduce
braking ability and create a tendency to jackknife when turning and braking at the same time.
If the loaded trailer ball height is greater than the uncoupled height, reduce take-up
on the spring bar, remeasure and adjust until the proper height is obtained.
Spring bars are under tension, handle with care.
Product Photo
Maintenance
Keep the socket-mounted ends of the spring bars and the lock pins
in the head assembly free from dirt and well lubricated. Excessive wear
in this area may indicate an overload or inadequate lubrication.
Keep the head assembly exterior clean. Do not allow dirt
or stones to lodge between the spring bars and the head.
Keep hitch parts painted to prevent rust and maintain good appearance. Do not paint over labels.
Keep lift brackets clean and lubricated to ensure ease of operation.
Parts List
Item Qty Description
1 1 Hitch head
2 1 Adjustable horn
3 2 Spring round bar
4 1 Adjustable shank
5 1 Clevis pin and clip
6 4 Serrated conical washer 3/4"
7 2 Cup point set screw, 3/4"-10
8 2 Nylock nut, 3/4"-10
9 2 Hex bolt, 3/4"-10 x 5"
10 2Snap-up bracket
11 1Clip
12 1Hitch pin

CURTMFG.COM •PRODUCT SUPPORT: 877.287.8634 •17510-INS-RA •02/08/2023 •ECN10468 •PAGE 2
ASSEMBLY & INSTALLATION
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Step 1 - Install head and spring bars
Install the head (#1) into the trailer coupler. Secure the head
by installing the trailer pin. Apply a heavy white lithium grease
on the round end of each spring bar (#3) and push end up
into the head socket until you hear a click. This will
indicate that the spring bar is locked into place.
To release the spring bar, lift up slightly on it and
gently pull out on the retaining pin in the hitch head.
The spring bar will drop free of the hitch head.
Step 2 - Mounting snap-up brackets
Adjustment of the bracket to fit the trailer frame requires the
snap-up mechanism to be removed. Remove the two 3/8"-16
hex bolts and pull out the mechanism. Ensure that the bushings
stay in the proper holes. Adjust the 1/2"-13 carriage bolts
to fit trailer frame and reinstall the 3/8"-16 hex bolts.
Parts List
Item Qty Description
1 1 Hitch head
2 1 Adjustable horn
3 2 Spring round bar
4 1 Adjustable shank
5 1 Clevis pin and clip
6 4 Serrated conical washer 3/4"
7 2 Cup point set screw, 3/4"-10
8 2 Nylock nut, 3/4"-10
9 2 Hex bolt, 3/4"-10 x 5"
10 2Snap-up bracket
11 1Clip
12 1Hitch pin
Bushings

CURTMFG.COM •PRODUCT SUPPORT: 877.287.8634 •17510-INS-RA •02/08/2023 •ECN10468 •PAGE 3
Step 3 (Continued)
Use the trailer jack to raise the head starting at level,
up 1/8” per 100 lbs. of tongue weight, up to a max of
1,000 lbs. or 1-1/4”. Unload the snap-up brackets by pulling
the wire lock clevis pin and pulling the lever towards you.
Step 3 - Calculate starting trailer height & unload snap-up brackets
Align the tow vehicle and trailer on level pavement in
a straight position. Use the trailer tongue jack to level
the trailer. Measure the distance from pavement to the
hook inside of the head and record here
Step 2 - Mounting snap-up brackets (Continued)
Mount the bracket assembly in the loaded position to the trailer
frame by inserting the carriage bolts through the adjustment
plate and tighten the two 1/2"-13 nylock nuts by hand. Slide
the spring bars into the snap-up bracket and move the bracket
until there is a minimum of four inches of the spring bars
sticking out. The height of the snap-up bracket mechanism should
be set by making the spring bars parallel to the trailer frame.
To adjust these, remove the two 3/8"-16 hex bolts and adjust up
or down. Ensure that there is at least one inch of clearance between
the bottom of the trailer frame and the top of the spring bars.
Torque all fasteners on the snap-up bracket
assembly. Torque the 3/8”-16 hex bolts to 39 ft-lbs.
and the 1/2”-13 carriage bolts to 68 ft-lbs.
Step 4 – Adjustment of shank and horn
Install the adjustable shank (#4) into the vehicle and measure from
the pavement to the tip of the horn. Adjust the height of the horn
(#2) by removing the 3/4”-10 hex bolts and moving the horn up and
down to get the closest to adjusted measurement from above without
exceeding. Reinstall the 3/4”-10 hex bolts (#9) and tighten by hand.
Run the set screws inside the horn to
make the horn parallel to the shank (no tilt).
4"

CURTMFG.COM •PRODUCT SUPPORT: 877.287.8634 •17510-INS-RA •02/08/2023 •ECN10468 •PAGE 4
Step 7 - Uncoupling
Recommended uncoupling procedure:
Run the jack down to take the load off of the spring bars.
Unload the snap-up brackets. Raise the jack until the locking pin can
be removed, then raise the trailer to take the head off of the horn.
Lower the snap-up brackets when not in use.
Step 5 – Hooking up trailer to vehicle
For vehicles with air springs, air shocks or automatic leveling systems
only, check the vehicle's owners manual or other instructions on these
items. Unless otherwise indicated, air springs and air shocks should
be deflated to their minimum recommended pressure
before assembling and adjusting the weight distribution hitch.
Pick reference points on the front and rear bumper of the
towing vehicle. Measure and record height to pavement.
Front bumper to pavement:
Rear bumper to pavement:
Back the vehicle up and lower the trailer jack onto the horn
and insert the locking pin and clip (#5) into the head and horn.
Snap-up one snap-up bracket at a time, ensuring that the clevis pin is
installed before taking pressure off of the handle. Measure the front and
rear bumper again. If you're within 1/2” of the measurement found at
the top of step 5, no further adjustment is needed.
Step 6 - Adjusting horn
If adjustment is needed to be within 1/2” of the initial bumper
heights, disconnect the head and horn and raise the head
off of the horn. Incrementally increase the tilt away from
the shank using the set screws. Repeat until measurements
are within 1/2” of starting bumper heights.
Max weight distribution has been reached when the
locking pin can no longer be inserted into the head and
horn freely. Once optimal position is achieved, torque
3/4” bolts to 200 ft-lbs. Tighten set screw to 200 ft-lbs.
Before You Tow
Check all connections listed below prior to towing:
- Hitch pin & clip (securing shank to receiver)
- Head to shank fasteners
- Trailer ball nut
- Coupler latch
- Spring bar support brackets
- Safety chains
- Lights and turn signals
- Braking system (including breakaway switch)
TOWING BASICS & SAFETY INFORMATION
For information on safely towing your trailer,
visit curtmfg.com/understanding-towing.
WARNING
Failure to tighten the hardware may result in fastener loss or failure.