Product Overview

The drive wheel — also called a drive sprocket, drive tumbler or final drive sprocket — is the toothed cast wheel at the rear of the track frame. It picks the track chain up from the idler, wraps it around the final drive and pushes the machine along. Everything the crane does in travel passes through this one casting, and the load lands on a handful of tooth faces rather than being spread across the whole undercarriage.

The wheel we supply for this Nippon crane is a direct replacement rather than an adapted part: cast body, radial arms, open cutouts between the arms, an internally splined hub and a drilled mounting flange. Those cutouts do more than they look. On wet clay, quarry grit or port dust they let spoil fall clear before it packs solid between the teeth and starts lifting the chain, and packing — not steel — sits behind most of the premature wheel failures we see on abrasive sites. It is the same reason crawler crane parts buyers who work mud and aggregate ask about the arm profile before they ask about the price.

Buyers usually arrive with one of three problems: the wheel is hooked and the chain is climbing, the machine is an older build and the number on the old wheel no longer cross-references, or a quotation is needed before a planned undercarriage overhaul. All three are workable. Send what you have — a photograph, a nameplate shot, a measurement across the hub — and we come back with the reference and the grade. That is how we prefer to handle crane spare parts: confirm the part, then talk about the order.

As crane parts suppliers go, our strength is the awkward end of the market. Common references sit in the Shenyang warehouse and move quickly. The difficult ones — a superseded number, a machine that was never sold in volume in your region, a wheel whose flange pattern changed mid-production — are traced from drawings, photographs and the original mounting dimensions.

Key Features

• Splined hub drive. Torque reaches the drive sprocket through an internal spline rather than a key, so the load is shared around the whole hub. The wheel runs concentric on the final drive, and the spline is the first thing to check if the track frame develops a knock.
• Open radial arms. The gaps between the arms let mud, grit and wet spoil drop clear as the wheel turns. Less packing means the chain sits down in the tooth roots where it belongs and the teeth wear evenly instead of running down one flank.
• Drilled to the original flange pattern. Mounting holes are drilled and aligned so the wheel seats square on the drive flange with the original fasteners — no slotting, no reaming, no machining on site.
• Interchangeable on the machine. The mounting is designed so a worn wheel comes off and a new one goes on with the track split and the machine on blocks. That is a shift job, not a workshop rebuild.
• One-piece cast body. Arms, rim and hub are a single casting, which keeps them together under the shock loads that arrive from rock steps, rail crossings and site debris.
• Protected through transit. Shot blasting followed by an anti-rust coat keeps the machined hub bore and bolt holes clean across a sea freight cycle, so the wheel is ready to hang rather than to clean.

Material & Heat Treatment

Alloy grade is the choice most buyers want to discuss, and it is worth the ten minutes. Three options are offered on this wheel, all heat treated after casting and all finished the same way.

35SiMn is the general-purpose grade. It heat treats predictably and gives a workable balance between a hard tooth face and an arm that can absorb impact without cracking — the sensible default for earthworks, general lifting and mixed site conditions.

35SiMnMo adds molybdenum, which improves hardenability and lets the steel hold its hardness deeper into the section. On heavier machines, or where the track works over rock and broken concrete and the teeth take repeated impact, that extra depth is what buys service life.

28CrMnMo is the chromium-bearing option, chosen where wear resistance matters more than pure toughness. Long travel on abrasive ground — quarry floors, dry sand, slag — is the usual reason a buyer moves up to it.

Every wheel is heat treated before finishing. The surface is then shot blasted to a uniform matte black finish, which strips casting skin and gives an even key for the coating, and an anti-rust coat goes on for transport and storage.

That anti-rust film is transit protection, not a working coating. Wipe the hub bore and the flange face down before fitting so the wheel seats metal to metal on the final drive, and touch in the coating wherever the fasteners cut through it.

Technical Specifications

Applications

• Mining and quarry floors. Abrasive grit, rock steps and constant tracking between benches. The open arms shed grit that would otherwise pack the teeth, and this is the duty where the molybdenum and chromium grades earn their price.
• Port and yard logistics. Hard concrete, short repeated moves, tight turning. Wear here shows on the tooth flanks rather than from impact, and heavy equipment spare parts at container terminals tend to be changed on hours rather than on failure.
• Bridge and road projects. Temporary haul roads, mud and clay. Packing is the main enemy rather than abrasion, which is exactly why the cutouts between the arms matter on this kind of work.
• Oilfield operations. Prepared pads, low travel speed, high torque through the final drive. Spline and bolt-hole condition matter more than tooth profile on this duty.
• Crane rental fleets. Machines move between sites and between operators. A wheel that can be swapped on site keeps a rented machine earning instead of sitting in the yard waiting for a workshop slot.
• Repair workshops and plant hire. Holding one matched wheel for the common machines in a fleet turns a two-week wait into a same-day repair.

Fitment Confirmation

1. Send the machine details from the nameplate. Model, serial number and year of build — a photograph of the plate is easier than typing it out and removes transcription errors.
2. Send a photograph of the old wheel. A clean top-down shot showing the hub, the spline and the full bolt-hole circle usually identifies the pattern on its own. Most of the construction machinery spare parts enquiries we handle start exactly this way.
3. Mark the key dimensions. Hub bore, flange diameter, bolt-hole count and the bolt-hole spacing across the circle. A sketch with the numbers written on it is perfect.
4. Count the internal splines. Spline count plus the bore through the hub separates the variants that look identical from the outside.
5. Describe the ground and the duty. Abrasive rock, wet clay, hard concrete, long travel or short shuttle work — that decides whether we recommend the standard grade or one of the tougher options.
6. Wait for written confirmation before the wheel is picked or cast. We reply with the matched reference, the recommended grade and, for a variant, a drawing to sign off.

Wear Signs & Replacement

• Hooked tooth profiles. Once the leading flank develops a hook, the chain no longer rolls off the tooth cleanly. You will hear a slap each time a link leaves the wheel, and chain life starts falling with it.
• Chain climb or jump. A worn wheel lets the chain ride up the tooth under load. If the track jumps a tooth on a turn or under pull, the wheel is usually the cause rather than the chain.
• Ramped or sharpened teeth. Teeth worn to a ramp still drive on flat ground but lose grip on a grade or when the track is loaded. Measure at the root and at the tip and compare against a new wheel.
• Elongated bolt holes. Fretting around the bolt holes means the wheel has been moving on the flange. Once the holes are oval the wheel will not hold torque and should come off.
• Worn hub spline. Rock the wheel on the final drive output with the machine stopped. Any perceptible movement means the spline is worn — replace it before it damages the shaft, which is a much larger repair.
• After fitting. Re-check bolt torque after the first shifts and keep track tension to the machine's own setting, and the wheel will wear evenly across the full tooth width rather than on one edge.

Hitachi Undercarriage Coverage

Hitachi machines are the oldest group we are still asked about, and the group where the paper trail is thinnest. Crawler crane parts enquiries for a KH machine often arrive with a unit that has been rebuilt two or three times, a wheel that has been replaced with something that nearly fits, and no usable number on the casting. Those we match from the mounting pattern rather than from a catalogue.

Coverage runs across the KH series (KH100, KH125, KH150, KH180, KH230, KH250, KH300, KH500 and KH700), the CX series (CX300, CX500, CX550, CX650, CX700 and CX900) and the PD piling rigs (PD7 and PD100). Beyond the undercarriage we also handle structure work for the same machines — crane boom parts, pins, link panels and sheaves — so a rebuild can be quoted as one list instead of five separate enquiries.

For a Hitachi wheel, the detail that decides fitment is the flange pattern and the spline, not the model year. Two machines of the same nominal model can carry different final drives depending on the build and the market they were sold into, so we confirm from the old wheel every time.

Sumitomo Undercarriage Coverage

• SC series. SC100, SC350, SC400, SC500, SC550, SC650, SC700, SC800 and SC1500 lattice-boom crawler cranes — the Sumitomo group we handle most often. The wheel pattern is consistent across most of the range, but not all of it, so the old wheel remains the reference.
• LS lattice-boom range. LS13RH, LS78RM, LS78RH5, LS78RHD5, LS98, LS108RM, LS110C, LS118RH3, LS118RH5, LS120RH5, LS138H, LS138RH5, LS208H, LS218H, LS218RH5, LS238RH2, LS238RH3, LS238RH5, LS458HD, LS468HD, LS518 and LS528. Long-lived machines, and a large share of the Sumitomo undercarriage business.
• SD series. SD205, SD307, SD407 and SD610. A lighter track frame than the LS range with a different wheel pattern — worth checking before assuming an LS wheel will fit.
• Where Sumitomo variants differ. The SC and LS families share a look but not always a flange. Spline count, hub depth and the bolt circle change between series.
• Ordering a Sumitomo wheel. Send the model and the bolt-circle dimensions from the old wheel. Where the machine is an LS with an early or late final drive, we will also ask for the hub depth.

Hitachi Sumitomo SCX Coverage

The SCX range is the joint Hitachi–Sumitomo line, and it causes more confusion than any other group we deal in. The same machine is quoted under both names, dealers list it under one or the other, and a buyer searching heavy equipment spare parts for an SCX often finds the reference filed under Hitachi when they expected Sumitomo. If you are unsure which side of the joint venture the number sits on, send both names and the serial number.

Coverage runs from SCX300, SCX400, SCX500, SCX700, SCX800, SCX900, SCX1200, SCX1500, SCX2000, SCX2500 and SCX2600 through to SCX2800. Undercarriage on these machines is heavy, and the drive wheel carries a large share of the wear, particularly on the larger models working quarry and port duty.

On an SCX, photograph the whole final drive area rather than just the wheel. The joint-venture builds went through revisions and the flange and spline changed with them, so a picture of the mounting on the machine settles the question faster than a number from a parts book that may predate the build.

Fuwa QUY Coverage

• QUY35 to QUY1250. QUY35, QUY50, QUY70, QUY80, QUY90, QUY100, QUY120, QUY150, QUY250, QUY320, QUY400, QUY500, QUY650, QUY750 and QUY1250. Of all the construction machinery spare parts we ship to contractors outside China, this is the group that moves most steadily: the wheel pattern is stable across a series and the machines are usually in daily service.
• Why Fuwa undercarriage wears the way it does. QUY cranes travel loaded more often than operators expect, especially on site-to-site moves, and the wheel takes the full load at the point where the chain leaves the ground.
• Matching a QUY wheel. The model number alone is not quite enough. QUY machines were built over a long period and the final drive changed on some models, so we confirm from the serial number and the old wheel.
• Mixed fleets. Fuwa and SANY machines often work the same contract. Buyers who already source SANY crane parts from us tend to add Fuwa undercarriage to the same list, but the parts do not interchange between the two brands even where the tonnage matches.
• Spares planning. For a fleet running QUY cranes, holding one drive wheel and one set of track hardware per size class usually covers a season of work.

SANY SCC Coverage

SANY's SCC range is the largest single group we supply, spanning SCC500, SCC550, SCC600, SCC700, SCC750, SCC800, SCC1000, SCC1250, SCC1500, SCC1800, SCC2600, SCC3000, SCC4000, SCC5000, SCC6500, SCC7500, SCC8100, SCC8200, SCC8300, SCC10000 and SCC16000. The small and mid-size lattice cranes are the volume end of the business; the large machines are usually planned replacements rather than emergencies.

On the SCC550, SCC600 and SCC650 the undercarriage group sits together: track shoe 14203939, bottom roller 14203935, upper roller 14211179, idler 14203936 and the drive wheel. Because we carry SANY crane parts across that group, a track frame overhaul can be quoted as one list and shipped as one consignment, which usually costs less than three orders spread over a month.

Undercarriage is the core of what we ship for SANY, but it is rarely the whole requirement. SANY filters, hydraulic components and electrical items are commonly added to the same shipment so a machine gets everything it needs in one delivery instead of three.

Zoomlion QUY Coverage

• QUY35 through QUY1250. QUY35, QUY50, QUY70, QUY80, QUY90, QUY100, QUY120, QUY130, QUY150, QUY180, QUY250, QUY320, QUY400, QUY500, QUY650, QUY750 and QUY1250 lattice-boom crawler cranes.
• What tends to fail first. On Zoomlion QUY machines the drive wheel usually outlasts the track shoes and bottom rollers, so by the time the wheel is hooked the rest of the undercarriage is close behind it.
• Confirming the build. Zoomlion revised final drives across the QUY range, so the same nominal model can carry two different flange patterns. Check the flange pattern before the wheel is picked.
• Structure for the same repair. A track incident sometimes turns into a boom inspection as well, and crane boom parts for the same machine can go on the same list.
• Keeping a fleet moving. Most Zoomlion buyers run two or three machines and order the wheel when the chain starts jumping. Keeping your serial numbers on file with us shortens the next enquiry to a single line.

Ordering & Delivery

1. Confirm the reference. Model, serial number and a photograph of the old wheel. We handle SANY crane parts and every other brand the same way: nothing is picked until the mounting pattern and the spline are confirmed against your machine.
2. Quantity. We ship from 1 piece upward, so a single wheel for a breakdown and a planned undercarriage change are handled identically. If the same machine also needs related crane spare parts — track shoes, rollers, a tensioner — list them together so they travel as one consignment.
3. Trade terms and port. EXW, FOB, CFR, CIF; shipped via Shanghai, Dalian, etc. Tell us which term and which port suit your forwarder.
4. Payment. T/T; Western Union or as agreed.
5. Dispatch window. Most parts in stock. Usually need 7-20 days, according to the quantity. If the wheel has to be cast or machined to a drawing, the schedule is confirmed before the order is accepted.
6. Consolidation. Hydraulic parts, electrical items, SANY filters and track hardware can all travel in the same case, which is usually cheaper than three separate shipments.
7. Packing. Wheels go out in export plywood cases with the machined faces protected, so the hub bore and bolt holes arrive clean and ready to fit.
8. Warranty. 2500 Working Hours or One Year.

Technical Support & Model Matching

Not sure which part fits your machine? Send the part number, the machine model, and a photo of the nameplate or the worn item, and our engineers — each with more than ten years in the construction machinery business — will confirm the correct reference and quote it. We advise on installation, help trace faults, and answer technical questions before and after dispatch. Since 2017 we have built this support on a supplier network covering FUWA, SANY, XCMG and ZOOMLION, so older and hard-to-find references can usually still be sourced.

FAQ