Mobile Pintle Hook & Lunette Ring Repair
Northern California
Serving Northern California's utility and heavy construction fleets. TruMac provides on-site replacement for worn lunette rings, drawbar eyes, and heavy-duty couplers. Whether you operate cable reel trailers, pole dollies, or heavy equipment flatbeds, we ensure your connection points are safe and compliant. Fleet yards 100+ trailers across Sacramento, Stockton, Lathrop, Modesto, Tracy, Roseville, Fairfield, Dixon, Elk Grove, West Sacramento & Woodland.
⚠️ Worn Lunette Rings Are a Safety Hazard
When the inside diameter of a lunette ring wears out of round, it can disengage from the pintle hook under load. We gauge and replace worn rings before they fail inspection or cause a coupling failure.
Visual Inspection & Replacement Services
🔍 Wear Gauge Inspection
Precision No-Go gauges measure internal wear on lunette rings and drawbar eyes. Compliant with DOT and fleet safety standards.
🚛 On-Site Fleet Service
We come to your yard. Service trucks equipped for cable reel trailers, pole dollies, generator trailers, and equipment haulers.
🔧 Heavy-Duty Installation
Fresh lunette ring installation with torqued Grade-8 bolts. Rated for utility and construction work. Welded options available.
Related Coupling Services: Hitch & coupler repair | Kingpin replacement (rare specialty) | 90-day BIT inspections
Understanding Lunette Rings & Drawbar Eyes
The lunette ring (also called a drawbar eye or pintle eye) is the heavy steel ring on the end of a trailer's drawbar tongue. It couples to the pintle hook mounted on the towing vehicle.
Unlike ball hitches used on consumer trailers, pintle-lunette systems are designed for heavy-duty applications: utility work, construction equipment, military trailers, and industrial hauling.
The Problem: Wear & Safety
The inside diameter of the lunette ring experiences constant friction against the pintle hook ball. Over thousands of coupling cycles, the ring wears:
- Out of round (oval shape)
- Larger than spec diameter
- Thinned walls at stress points
When wear exceeds limits, the ring can disengage under load.
The Solution: Inspection & Replacement
We use precision No-Go wear gauges to measure internal diameter. If the ring fails the gauge test, we replace it on-site:
- Bolt-on installation (most common)
- Welded installation (when required)
- Grade-8 hardware, torqued to spec
Utility Fleet Specialization
TruMac specializes in utility company trailers that see demanding service cycles:
Heavy industrial cable spools for underground utility work
Transport utility poles in tandem configurations
Mobile power generation units for emergency response
Flatbeds and lowboys for backhoes, trenchers, utility equipment
Related Services: Landing gear repair | Air brake service | Kingpin replacement (rare specialty)
FAQ: Pintle Hook & Lunette Ring Service
What is a lunette ring and why does it need replacement?
A lunette ring (also called a drawbar eye) is the connection point on a trailer tongue that couples to a truck's pintle hook. Over time, the inside diameter wears out of round due to friction and load stress. When wear exceeds safety limits, the ring must be replaced to prevent coupling failure.
Do you service utility company trailers?
Yes. We specialize in utility fleet trailers including cable reel trailers, pole dollies, generator trailers, and equipment haulers. We understand the demanding cycles these trailers endure and carry heavy-duty replacement parts rated for utility work.
Can you gauge lunette rings for wear inspection?
Absolutely. We use precision No-Go gauges to measure internal wear on lunette rings. If the ring fails the gauge test, we can replace it on-site in your yard without requiring a shop visit.
Do you work on construction equipment trailers?
Yes. We service heavy equipment trailers, lowboy trailers, and construction flatbeds that use pintle-eye couplers. We carry Grade-8 hardware and torque all fasteners to manufacturer specifications.
What other coupling services do you offer?
We provide comprehensive coupling services including hitch repair, coupler replacement, converter dolly maintenance, and kingpin replacement - one of the few mobile services in Northern California doing this rare specialty work.
See kingpin replacement service →
View hitch & coupler services →
What size fleets do you work with?
We specialize in fleet yards operating 100+ commercial trailers across Northern California. No roadside or freeway service.
Professional Lunette Ring & Drawbar Eye Service
Northern California's trailer coupling specialists. Precision gauging, heavy-duty replacements, on-site service. Fleet yards 100+ trailers only.
📞 CALL (916) 320-2425