Mechanical

Mechanical Services.

Gearbox and winch overhaul, bearing and brake work, couplings, shafts and steel structure repair.

Service line 03Hydraulic · Mechanical · ElectricalReport included

Planetary gear set removed from a crane gearbox — Planetary gears

01What we do

When the hydraulics are right and the crane still misbehaves, the problem is usually mechanical: a worn planetary stage in a winch gearbox, a slewing pinion with chipped teeth, a brake lining that has glazed, a coupling that has lost its alignment.

When the hydraulics are right and the crane still misbehaves, the problem is usually mechanical: a worn planetary stage in a winch gearbox, a slewing pinion with chipped teeth, a brake lining that has glazed, a coupling that has lost its alignment. These are the parts that carry the load, and they wear in ways that pressure readings do not show.

Our mechanical team dismantles gearboxes, winches and slewing drives, measures the wear against the maker's limits and renews gears, bearings, seals and brake components. Shafts and couplings are checked for runout and alignment. Where a part cannot be bought, we have it machined from drawings or from the worn sample.

Structural work covers cracked boom sections, corroded pedestal flanges, worn pin bores and damaged cabin frames: cutting, welding, line boring and bushing, with the crane returned to its original geometry.

Red crane gearbox on the workshop bench — Gearbox03

What to send us

Gearbox or winch type plate and ratio if known
Oil condition and any metal found on the magnetic plug
Noise, vibration or play described by the crew
Access: can the unit be lifted off on board, or is a workshop visit needed?

Describe the job

02Scope

What the service covers.

The work items under this service line, as listed by our engineers.

01
Gearbox OverhaulingWinch, slewing and travel gearboxes stripped, gears and bearings measured, worn parts renewed, backlash set, oil and seals replaced.
02
Winch Repair / MaintenanceHoist and luffing winch drums, drum bearings, rope guides, brake bands and discs, drive couplings.
03
Bearing ReplacementSlewing bearings, drum bearings, motor and gearbox bearings fitted with the correct clearances and preload.
04
Brake System MaintenanceMulti-disc hydraulic brakes, band brakes and spring-applied brakes: linings, springs, release pressure and holding test.
05
Coupling / Shaft RepairAlignment, keyway and spline repair, new shafts machined to drawing, flexible coupling elements renewed.
06
Mechanical Component ReplacementPins, bushes, sheaves, pedestal bolts, cabin fittings and guards supplied and fitted.
07
Steel Structure RepairBoom, pedestal and foundation repairs, line boring of pin bores, welding and non-destructive testing where required.

On the job

Photos from recent attendances.

Yellow multi-stage planetary gearbox on a pallet in the workshop — Planetary gearbox01

CranesTech technician stripping a large drive unit on a workshop bench — Workshop strip-down02

Two technicians beside a stripped drive unit in a workshop hall — Workshop03

03Typical jobs

Faults we are called for.

01Winch gearbox noisy under load: planetary stage opened, worn sun gear and bearings replaced, backlash set.
02Slewing pinion teeth worn: new pinion fitted, ring gear inspected and meshing adjusted.
03Brake will not hold the proof load: linings, springs and release circuit renewed and tested.
04Boom pin bore oval: line bored on board and fitted with a new bush and pin.

04Questions

Asked before the first visit.

Can gearboxes be overhauled on board?

Smaller winch and slewing gearboxes can be opened and repaired on board. Larger units or those with damaged housings are brought to the workshop, which has the lifting and measuring equipment for the job.

Do you manufacture replacement gears?

Yes. Where the maker cannot supply, gears and shafts are made to drawing or reverse-engineered from the worn part, heat treated and ground as the original.

Spare parts / equipment