This is a Japan-built Kawasaki motor and reducer, supplied under the M5X-180A0BT14A-45A-RG23C34B5-L designation. The hydraulic motor and the planetary reduction stage are built into one cast steel housing and bolted together as a single assembly, so a failed crane drive is renewed by changing one unit instead of rebuilding a motor and a gearbox separately and hoping the two line up again.
It is used on FUWA, SANY, XCMG and ZOOMLION crawler cranes and takes the place of the original drive at the winch, the slewing ring or the travel motor, depending on the machine's layout. Everything inside it is mechanical and hydraulic, and there are no crane electrical components in the housing — a fault traced to the drive is solved by replacing the drive, not by chasing a loom in the cab.
Identification is physical. Each unit carries its Kawasaki Heavy Industries nameplate, a MADE IN JAPAN marking, the type code and an individual parts label with a barcode and the part codes beside it. A square-on photograph of that plate is the single most useful thing you can send with an enquiry, because it settles flange, ratio and shaft end at the same time.
Workshops that keep crawler crane parts on the shelf tend to treat a hoist drive as insurance rather than stock: one unit sits on the shelf until the day a machine stops, and then it earns its keep in a single shift.
The range is arranged by family, so an order can be placed against the machine instead of against a catalogue page. Rexroth GFT gearboxes — GFT 80T3, GFT 90T4 and GFT 110WK4 — cover FUWA crane slewing and hoist systems. Kawasaki K3V/GPC and K5V series reducers handle SANY drilling rig rotation drives. Custom three-stage hoist gearboxes are built for XCMG lifting winches and boom control, and Huade HD-HB hydraulic gearboxes fill the China OEM slot for cost-efficient retrofit work.
Working as crane parts suppliers for fleets that run more than one brand, we keep those four families cross-referenced rather than filed apart, so a Rexroth number and its Kawasaki equivalent can be quoted in the same reply instead of being hunted down separately.
Ratios across the family run from 5:1 to 200:1, and torque capacity reaches 500 kNm on a custom build, matched to the load the drive actually has to move rather than to a round catalogue figure.
Huade HD-HB is the value end of construction machinery spare parts: a China-built OEM gearbox for older machines where the original number has been dropped and a new GFT unit no longer makes sense for the work the machine does. The same duty is covered at a lower torque ceiling, which is why it suits smaller cranes and lighter lifting patterns.
| Parameter | Rexroth GFT Series | Kawasaki Reducers | Huade OEM |
|---|---|---|---|
| Max torque | 180–500 kNm | 100–350 kNm | 80–300 kNm |
| Efficiency | ≥96% | ≥94% | ≥92% |
| Mounting | Flange/bolt-on | Spline/keyed shaft | Custom flanges |
| Lubrication | Synthetic oil (ISO VG 320) | Grease/oil bath | Oil bath |
| Operating temperature | −30 °C to +120 °C | −20 °C to +100 °C | −20 °C to +90 °C |
The gears are cut from 20CrMnTi alloy steel and case-hardened to HRC 58–62. That gives a tooth surface hard enough to resist pitting and a core still tough enough to absorb the shock of a load dropped onto the rope — a combination a soft gear set cannot survive for long.
The housing is a cast steel body with machined mounting faces and threaded ports, finished in red paint and closed with a screwed-on Kawasaki nameplate. Cast steel rather than fabricated plate matters on a drive that is bolted to a winch frame and expected to hold alignment through years of vibration.
Sealing is rated IP65, so dust and low-pressure water jets do not get past the housing. On a site where machines are washed down at the weekend and run in grit all week, that is the difference between a drive that stays dry and one that starts weeping oil after a season.
The oil grade listed for your series is part of the specification, not an afterthought. Of all the hydraulic crane parts on a machine, the reducer is the one that spends its whole life in oil, and the oil is the maintenance.
Gear designs are checked with ISO 6336 stress analysis, and units go through a 72-hour full-load trial before they are released.
A drive failure rarely travels alone. The seal kit that was already weeping, the bearing that came out with the shaft and the balance valve bolted to the motor usually need attention at the same time, and ordering them together is quicker than starting a second search once the drive is on the bench.
Seal kits and bearings are held for the gearbox families on this product and matched to the series, so the lip seals and bearing bores line up with the housing they are going into rather than being sold as a one-size kit.
Of all the hydraulic crane parts on a machine, the balance valve is the one most often overlooked when a motor is changed. It sits between the motor and the winch and governs how a load is held when the operator lets go of the control, and a new drive behind a tired valve will still let that load creep.
We also carry crane electrical components for the same machines — controllers, monitors, limiters, angle and length sensors, pedals and joysticks — which matters when a fault is being chased across both sides of a machine at once.
Because the whole list is held as crane spare parts in one warehouse, a drive, a seal kit and a valve can be checked and packed in a single consignment instead of arriving in three.
Mobile crane parts for ZOOMLION QY-series truck cranes sit alongside the crawler lines, so a mixed fleet can be covered without splitting the order.
| Minimum order | 1 piece |
| Payment | T/T; Western Union or as agreed |
| Lead time | Most parts in stock. Usually need 7-20 days, according to the quantity. |
| Custom-built gearboxes | 25–30 days from drawing approval |
| Port of loading | Shanghai, Dalian, etc. |
| Trade terms | EXW, FOB, CFR, CIF |
| Packing | Export-grade packing suitable for a sea leg |
| Warranty | 2500 Working Hours or One Year |
Not sure which part matches your machine? Send us the model, serial number and the original part number — or a photo and key dimensions — and our engineers will confirm the correct item and check availability before you commit. They have spent more than ten years in construction machinery and can talk you through fault-finding, installation and commissioning by phone, email or video. We also trace parts for discontinued and legacy models. Support runs 24/7 from Shenyang, China, where we have been supplying buyers since 2017.
The unit on this product is built by Kawasaki Heavy Industries in Japan, and the housing carries the Kawasaki nameplate, the MADE IN JAPAN marking and a stamped type code. Rexroth GFT-pattern and Huade HD-HB gearboxes are supplied as OEM-compatible alternatives for machines where the original has been dropped or where a Japanese unit is no longer the practical answer. Tell us which of the two you are looking for and we will confirm what is actually available. Most crawler crane parts enquiries start with a photograph of the old plate, and that is the quickest way to settle it.
Usually, yes. Send the drawing or the number stamped on the plate and the ratio, flange and shaft end are matched from the current families; where the original material grade is no longer produced, an upgraded grade is used in its place. As crane parts suppliers we keep old and new numbering side by side, so a number that was dropped years ago can still be traced to a unit that fits the machine.
Yes — seal kits, bearings and the small hardware that goes with a drive change are supplied against the same series numbers, so they arrive matched to the housing rather than as a generic kit. Give the reducer number when you ask and the right kit can be picked without anyone measuring a bore on site.
Send the machine model, the serial number if you have it, the number on the old unit's plate, and the pump specification if you know it — a Rexroth A11VO is the usual pump specification we see on these machines. With those four, the flange, ratio and port layout can be checked against the drawing. One photo of the plate and one of the mounting face usually settles it faster than a written description. If the hydraulic crane parts on the machine have been changed or the machine was repowered at some point, say so, because the drive may not be the original fitment.
The indicator reads load from its own load cell rather than from the gear ratio, so a like-for-like replacement does not change what it displays. Fit a different ratio or a different family and the relationship between hydraulic pressure and line pull shifts, which is why the system has to be checked against a known load afterwards. Tell us if the new unit is a different ratio from the old one and it will be flagged before anything is packed. Either way, treat the crane load indicator check as part of the first run rather than an optional extra.
Yes. The catalogue covers crane electrical components — controllers, monitors, limiters, angle and length sensors, pedals and joysticks — and the hydraulic side: pumps, motors, valves and seal kits. Mobile crane parts for ZOOMLION QY-series machines are held alongside the crawler lines, so a fleet running both can put one enquiry through instead of three.
Every unit is 100% new — no refurbished cores and no re-labelled returns. That matters most on a hoist drive, where a reworked housing is very hard to spot from the outside. In construction machinery spare parts the difference between new and rebuilt is usually invisible until the second failure, which is why the plate and the packing label are worth photographing on arrival.
