Hydraulic Surge Couplers

Hydraulic Surge Couplers

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TextModel DA91 is a heavy duty surge brake actuator for trailers with two or four wheels. When brakes are applied on the towing vehicle, forward inertia of trailer toward towing vehicle applies brakes on trailer in direct relation to manner brakes are applied on towing vehicle. Brake towing vehicle hard and brakes on trailer are applied hard. Master cylinder push rod spring assembly protects system from hydraulic pressure overload.

Part #	Description
21-111	Demco 2″ Surge Coupler (Bulldog Head) – 7000 lbs.
21-112	Demco 2 ⁵/_16″ Surge Coupler (Bulldog Head) – 7500 lbs.

Part #	Description
21-406	Demco DA10 Surge Coupler w/ Levelor Channel – 10K (requires adj. coupler head)
21-406-A	Replacement Master Cylinder Kit – Includes Gasket, Bolts, & Boot
21-406-B	Replacement Master Cylinder Cap – Includes O-Ring
21-303	Bolt & Nut (2 required)

The Titan MD-60 coupler has a 6,000 pound capacity (max. G.V.W.R.) and 600 pound tongue load. It is designed for a 3” wide trailer tongue. The unique adjustable feature allows it to fit either an 1 7/8” ball or a 2” ball.

Part #	Description
21-410	Dico Model 60 Multi-fit Surge Coupler (1 7/8’ – 2” ball)
21-411	Replacement Multi-fit Repair Kit Only
21-412	Replacement Lever Lock Repair Kit Only
21-306	Replacement Master Cylinder Kit Only
21-306-2	Replacement Master Cylinder Repair Kit Only
21-307	Replacement Filler Cap Only
21-308	Replacement Shock Only

Part #	Description
21-400	Dico Model 10 Surge Coupler w/ 2 5/16” Head – 10K
21-401	Dico Model 10 w/ Leveler Channel
21-305	Replacement Master Cylinder Rebuild Kit (MD10/20)
21-305-1	Replacement Master Cylinder Only (MD10/20)
21-320	2 5/16” Coupler Repair Kit Only (MD10)
21-414	Replacement Shock Only (MD 10)
21-321	Replacement Filler Cap & Gasket Only (MD10)
21-309	Replacement Cover (MD10)

Part #	Description
21-300	Dico Model 20 Surge Coupler w/ Channel (20,000 lbs.)
21-300-1	Dico Model 20 Surge Coupler w/ Pintle Ring (20,000 lbs.)
21-300-2	Dico Model 20 Surge Coupler w/ 2 5/16” Head (20,000 lbs.)
21-300-3	Dico Model 20 Surge Coupler w/ no Head (20,000 lbs.)
21-305	Replacement Master Cylinder Rebuild Kit (MD10/20)
21-305-1	Replacement Master Cylinder Only (MD10/20)
21-310	Replacement Shock (MD20)
21-321	Replacement Filler Cap & Gasket Only (MD20)
21-309	Replacement Cover (MD20)

Adjustable Head Sets

This coupler can either be used in conjunction with the surge couplers above or with the leveling channel . G.V.W.R. 12,000 lbs.

Part #	Description
21-302	2 5/16” Head Assembly

Heavy duty steel construction, multi-position mounting in either 3 position, 5 position channel or weld style.
Zinc-plated easy latch mechanism allows for quick engage/disengage of coupler.
Capacity: 12,000 lbs. M.G.T.W. (2-5/16″) — 10,000 lbs. M.G.T.W. (2″)

Part #	Description
21-302-1	2 ⁵/₁₆“Coupler, 12K, Bolt-On, Painted (12K)
21-302-2	2″ Coupler, 10K, Bolt-On Painted (10K)
21-303	Bolt & Nut GR5

Designed for “tag along” trailers used primarily in the construction business,
BULLDOG forged adjustable couplers allow level towing behind a variety of towing vehicles.
The height of the trailer tongue may be quickly adjusted to match the height of the hitch ball for safer, smoother towing. Couplers fit inside a 2 ⁷/₈” wide channel. For leveling channels, see below.

Part #	Description
21-302-4	2″ Adjustable Forged Head – (7K)
21-302-3	2 ⁵/₁₆” Adjustable Forged Head – (12.5K)

Unique cast steel shield prevents damage to coupler latching mechanism
Patented Wedge-LatchT design act like a vise, keeping the trailer ball locked in the ball pocket
Hardened steel field serviceable ball clamp provides years of trouble free towing and eliminates need to replace coupler
Fast, convenient latching simplifies hook-up and saves time. No more fighting calm shell style latching mechanisms
Rust resistant grey dip primer ensures total coverage and excellent corrosion resistance

Part # Description

21-302-6 2 ⁵/₁₆” Adjustable Cast Head – (14K)

Note: Bolts and nuts included. For leveling channels, see below.

Capacity: 2,000 lbs. maximum vertical load / 12,000 lbs. M.G.T.W.
3″ I.D. eye 1-9/16″ eye section.

Part #	Description
21-301	Buyers 3″ Pintle Ring Assembly

Leveling Channel

Part #	Description
21-304	4-Hole Leveler Channel
21-430	6-Hole Leveler Channel w/Gussets
21-303	Bolt & Nuts (2 required)
21-430-1	6-Hole Leveler Channel w/o Gussets

When installed between the hyd. surge coupler and the brake line, it makes it possible to back-up without activating the brakes.

Part #	Description
18-976	Hyd. Brake Lock Out Solenoid

Used to hook hydraulic actuators to hydraulic braked axles.

Part #	Description
21-500	Single Sprung Axle Plumbing Kit
21-501	Single Torflex Axle Plumbing Kit
21-501-1	Single Torsion Line Kit
21-600	Tandem Sprung Axle Plumbing Kit
21-601	Tandem Torflex Axle Plumbing Kit