How to Replace a DLM Dock Leveler Lift Arm, Hinge Pin & Roller: Step-by-Step Guide
The lift arm assembly is what actually raises and lowers a DLM dock leveler's deck, and it takes more abuse than almost any other part on the leveler — pivoting thousands of times a year under loads that can run into the tens of thousands of pounds. When a lift arm, its pivot pin, or the roller it rides on wears out, the deck starts to feel loose, uneven, or noisy under a forklift. Here's how to identify which part has failed and replace it.
Step 1: Confirm it's the lift arm, not the hinge
Before ordering parts, jack or block the deck safely and watch the lift arm as a forklift crosses (or simulate the load by hand if the dock is idle). If the deck rocks side to side at the point where the lift arm meets the frame, or you can see visible play in the roller, the lift arm or its roller is worn. If the play is at the rear of the deck where it meets the pit, that's the hinge — a different repair.
Step 2: Identify your lift arm style
DLM used several lift arm styles across its "C" and "D" series levelers, and they are not interchangeable. Common replacements include the 25" lift arm, the new-style lifting arm with a 2" roller, the old-style lifting arm with a 4-1/2" roller, and the "D" series lift arm with roller. Pull the part number off your existing arm before ordering, or measure the roller diameter — mixing old-style and new-style arms on the same leveler is the single most common mistake we see on this repair.
If only the roller has worn — flat-spotted, cracked, or seized on its shaft — rather than the whole arm, the "C" Series lift arm roller kit is a cheaper fix than replacing the full arm. Check this first if the arm itself still looks straight.
Step 3: Replace the pivot pin
The lift arm pivots on a pin that wears an oval hole into itself and the arm over years of cycling. If you're replacing the arm anyway, replace the pin at the same time — reusing a worn pin in a new arm just transfers the play back in a few months. DLM's "C" Series uses the 1" diameter C-Lift Arm pivot, while the "D" Series uses the 1-1/16" diameter pivot pin. A separate pivot pin kit with washers and roll pins is available if your original hardware is missing or rounded off.
Step 4: Check the hinge pin while you're in there
Since you'll already have the deck supported and the leveler apart, it's worth inspecting the rear hinge pin — it's a five-minute check that saves a second service call. The rear hinge pin kit and the shorter 1" x 3" hinge pin kit cover the most common DLM configurations.
Step 5: Torque, cycle, and recheck
Once the new arm, roller, and pins are installed, cycle the leveler empty a few times before loading it, and recheck bolt torque after the first day of use — new pivot hardware tends to seat slightly and can loosen a touch on day one.
Not sure which parts fit your leveler?
DLM's part numbering changed over the years and old service tags sometimes list superseded numbers. Send us your leveler's model and serial info and we'll confirm the exact lift arm, roller, and pin combination before you order.
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