Dexter Torsion (Torflex) Axles
- Differentiate between Torflex axle components and standard leaf spring suspension systems.
- Evaluate ride height by inspecting torsion arm angles for signs of overload or wear.
- Identify non-serviceable internal components requiring complete axle replacement.
- Torque wrench — Ensure mounting bolts are tightened to the manufacturer's specified torque.
- Angle gauge — Measure the torsion arm angle relative to its original design to check for sagging.
- Measuring tape — Verify ride height consistency across the trailer frame.
- Heat shield or welding blanket — Protect rubber cords from heat damage if welding must occur near the axle tube.
Torflex axles use rubber cords inside the axle tube in place of leaf springs; there are no shackles or equalizers to wear.
The torsion arm angle sets ride height. Arm angle that has dropped well below the original angle points to an overloaded or worn axle.
Torsion axles are not serviceable internally; a sagging axle is replaced.
Mounting bolts must be torqued to the maker's spec, and welding near the rubber can damage it.
How It Works
Rubber Cord Torsion Design
Torflex axles utilize rubber cords inside the axle tube to provide suspension. This design eliminates the need for traditional leaf springs, shackles, or equalizers, thereby reducing the number of external wearing parts.
Ride Height and Arm Angle
The ride height of the trailer is determined by the torsion arm angle. An arm angle that has dropped significantly below its original factory setting indicates that the axle has been overloaded or has reached the end of its service life due to wear.
Serviceability Limits
Torsion axles are engineered as non-serviceable units regarding their internal components. If the rubber cords fail or the axle begins to sag, the entire axle assembly must be replaced rather than repaired.
Diagnostic Chart
| Symptom | Check | Spec / Expected | Likely cause & fix |
|---|---|---|---|
| Trailer ride height is noticeably lower than original specifications. | Inspect the torsion arm angle and compare it against the original factory angle. | Per the applicable manual | The axle may be overloaded or the internal rubber cords have worn out. Basis: Dexter Axle Operation, Maintenance & Service Manual (600-8000) |
| Torsion arm angle has dropped well below the original starting angle. | Perform a visual inspection for signs of overloading and check for internal rubber degradation. | Per the applicable manual | Overloading or age-related wear of the internal rubber cords. Basis: Dexter Axle Operation, Maintenance & Service Manual (600-8000) |
| Visible damage to rubber cords following nearby trailer frame repair. | Verify if welding or high-heat operations were performed near the axle tube. | Per the applicable manual | Welding heat transferred to the rubber cords, causing structural damage. Basis: Dexter Axle Operation, Maintenance & Service Manual (600-8000) |
At the Bay: Diagnose the Case
CASE 1 / 3
Trailer ride height is noticeably lower than original specifications.
- Test
- Compare
- Correct
Select the next check
Basis: Dexter Axle Operation, Maintenance & Service Manual (600-8000). A likely cause is a hypothesis; confirm it with the applicable service procedure before repair.
Common Bay Mistakes
- ✕ Attempting to service or replace internal rubber cords.
- ✕ Ignoring sagging torsion arms instead of replacing the axle.
- ✕ Welding near the axle tube without protecting the internal rubber.
- ✕ Neglecting to torque mounting bolts to the maker's specific requirements.
- ✕ Searching for shackles or equalizers on a Torflex system.
Quick Check
Practice only — not scored.
Hands-on: Shop Test Equipment
Dial Indicator — Bearing End Play
Magnetic-base dial indicator (0.001 in) on the hub face, spindle nut adjustment
🛠 Equip your bay for this test →Symptom: Bearing service — set end play after repack.
Spec limits used
- 0.001–0.010 in — Allowable end play, double-nut wheel end (Dexter 9-15K service manual, p.64)
- 0.008 in — Nev-R-Lube 50 mm max axial end play (Dexter 059-831-00)
- illustrative only — Face runout limit (General shop practice)
Simulated readings for practice. Always follow the manufacturer's procedure and values on a real trailer.
Source: Dexter Axle Operation, Maintenance & Service Manual (600-8000)