A worn traction sheave shortens rope life fast. Left unchecked, it accelerates wear on new ropes, reduces drive efficiency, and can cause slippage under load. For a maintenance contractor, the question is rarely whether to act, but whether the sheave can be restored in place or whether it has to come out.
Here is how we assess sheave wear and decide between re-grooving and replacement.
Signs of sheave wear
The most common indicators are uneven rope wear, rope groove profile that no longer matches the rope diameter, visible scoring or polishing in the groove base, and a drop in drive efficiency under load. If new ropes are wearing prematurely on a machine that has just been re-roped, the sheave is usually the first place to look.
Measuring the rope groove profile
The decision turns on the groove profile. We measure the groove radius and the wear pattern against the rope specification. Where the groove has widened but the cast iron is sound, re-grooving restores the profile and the drive efficiency without pulling the machine. Where the groove is deeply scored, cracked, or the cast iron is degraded, replacement is the safer economic call.
When re-grooving works
Re-grooving is carried out on site, with the machine in place. It restores the correct rope groove profile, improves drive efficiency, and extends rope life without the lead time and structural work involved in a full sheave replacement. It is the right option where the sheave body is intact and only the groove profile has drifted.
When replacement is unavoidable
Replacement becomes necessary where the sheave is cracked, where re-grooving would cut below the minimum safe diameter, or where a modernisation is upgrading the rope system. In those cases we coordinate the replacement alongside the re-rope so both land under one scope.
At EES Vertical Transportation, we carry out traction sheave repair and re-grooving for lift contractors who have identified sheave wear on a machine and need a specialist to assess and restore groove profile without pulling the machine from site. All work is carried out with full RAMS documentation. Carried out by our specialist engineers from Middleton, Greater Manchester. See our traction sheave repair and re-grooving service for the full scope.