6735884 6662997 Belt Tensioner & Fan Pulley Kit – Verified Fitment for Bobcat Loaders

Verified Fitment — cross-reference checked against serial range and pulley mounting pattern before dispatch for this Bobcat loader belt drive kit.

Technical Specifications

Application Suitability

Why the Same Part Number Ships in Several Variants

The base number resolves to different pulley diameters and tensioner arm lengths depending on engine generation.

When you look up a Drive Belt Tensioner & Fan Pulley Kit for Bobcat S130 S150 T190 cross reference online, you often find a single number covering multiple machine generations. In practice, the tensioner pivot pin diameter and the fan pulley belt track profile changed between early and late Kubota engine installations. I have seen kits arrive with the right reference stamped on the box but the wrong spline count on the pulley hub — forcing a trial fit that scores the belt on startup. Copied cross-reference tables between sellers carry these errors forward, so a number that is correct for an S130 serial prefix may not clear the fan shroud on a T190 [NEED_CITE: belt drive component supersession practices in compact loader service].

Fitment Range Across Serial Generations

A Drive Belt Tensioner & Fan Pulley Kit for Bobcat S130 S150 T190 cross reference must cover machines spanning the 653 through the T190 series. Each model family uses a different engine block configuration, and the accessory drive layout shifts accordingly. The tensioner arm reach, pulley offset from the block face, and fan shroud clearance all change between serial breakpoints. We verify the specific engine serial before confirming the kit.

Interface Verification Before the Order Ships

The critical dimensions go beyond the reference number. Pulley bore diameter, keyway width, belt track groove count, and the tensioner spring anchor position must all match the machine build. A mismatch in any one interface means the belt either tracks off-center or the tensioner cannot maintain correct preload. We confirm mounting hole spacing and pivot geometry against your serial data before dispatch [NEED_CITE: compact loader accessory drive belt alignment specifications].

Dimensional Tolerances That Matter on Site

Pulley runout and belt track concentricity directly affect belt life. Excessive runout causes the belt to flap at high RPM, generating heat and accelerating wear at the cord line. The bearing preload inside the fan pulley hub must hold the shaft without wobble while still allowing free rotation at idle. Tensioner spring rate determines how well the system absorbs shock loads when the hydraulic pump engages suddenly — too soft and the belt slips, too stiff and bearing load increases.

The Cost of a Near-Miss Fitment

A tensioner that bolts on but has the wrong arm angle will apply insufficient belt tension under load. The machine runs fine at idle, then the belt chirps and slips the moment the loader circuit demands full hydraulic flow. Operators often respond by increasing idle speed, which masks the problem temporarily but accelerates belt and bearing wear. The machine goes back down within weeks for the same job, and the real cause is never logged [NEED_CITE: belt slippage misdiagnosis in skid-steer loader service records].

Why Buyers Source This Kit Here

Our production lines and qualified partner facilities operate under the same warranty and QC protocol, so whether a tensioner arm is self-produced or sourced, it ships with consistent dimensional verification. Eight component categories sit under one account — so if your repair list also calls for filters, seal kits, or undercarriage parts, everything moves in one consignment. Minimum order is one piece, which matters when a single machine is down and you need a confirmed fitment before committing to fleet-level quantities. The technical team identifies the correct variant from your machine model, serial number, or even a photograph of the worn nameplate. Cross-reference verification covers superseded and alternate numbers, and we supply samples for physical fitment trials before you place a bulk order.

Documentation & Verification

• Commercial invoice and packing list referencing each variant number
• Compatibility and cross-reference sheet marked reference only
• Dimensional inspection record covering pulley runout and bore tolerance
• Warranty terms covering 3–12 months against defects
• Packing photographs showing kit contents before crate closure
• HS code and customs classification for belt drive assemblies

Fitment Check Before Installation

• Compare new pulley bore and keyway against the removed unit
• Verify tensioner arm pivot pin matches the bracket hole diameter
• Check belt track groove count and profile against the old belt
• Confirm fan pulley offset clears the shroud at all positions
• Run the engine at idle and observe belt tracking for two minutes

Share Your Machine Details for Fitment Confirmation

Send your Bobcat loader model and serial number, or a photograph of the existing tensioner and pulley assembly if the labels are worn. We will return a verified cross-reference and dimensional confirmation so you can proceed with confidence. If you are evaluating for multiple machines, include each serial prefix to catch variant differences across the fleet.

Frequently Asked Questions

Q: How do I confirm this tensioner and pulley kit fits my specific Bobcat loader serial number? A: Provide the full serial number from your machine data plate. We cross-check the engine build record to confirm pulley bore size, keyway dimensions, and tensioner arm geometry match your specific serial range. If the data plate is unreadable, a photograph of the old assembly works for visual identification.

Q: My old part number is different — is 6735884 or 6662997 a valid superseded replacement? A: Both numbers serve as cross-reference identifiers and may supersede earlier references depending on machine generation. We verify the supersession path against your serial number before confirming. Some older machines require an intermediate adapter bracket that later serials do not use.

Q: Why does the same base number appear in several variants, and which one fits my machine? A: Bobcat revised the accessory drive layout across engine generations and model updates. Pulley offset, tensioner spring anchor position, and belt track width changed at specific serial breakpoints. We identify which variant matches your build by checking the engine serial against the factory configuration record.

Q: I only have the machine model with no readable part number — can you still identify the right kit? A: Yes. Send us the machine model and, if available, the serial number prefix. A clear photograph of the old tensioner arm and pulley — especially the mounting face and hub — allows our team to identify the correct variant even when all labels have worn away.

Q: Can I order a sample to test fitment before placing a larger order? A: Sample supply is available for fitment confirmation. You receive one complete kit to install and verify clearances, belt tracking, and tensioner preload on your specific machine before committing to fleet-level quantities.