Belt Drive Systems
Belt Tensioner 6735884 Replacement for Bobcat T140-T590 Powertrain
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<p><strong>V-Belt 178509, CX Profile 22 mm × 1147 mm</strong> — replacement for Cummins N14, NT855, NH855, NTA855, NH220, and NH250 engines. Part of the belt drive system powering the water pump, alternator, and fan; polyester cord reinforcement in heat- and oil-resistant rubber suits high-temperature engine compartments. Replacing the belt alone without inspecting tensioners, pulleys, and driven accessory bearings risks premature repeat failure. Cross-reference 76107717 provided for verification.</p> <ul> <li>Overhaul kit contents verified item by item before dispatch</li> </ul>
MOQ
1 Piece
Lead Time
2-5 Business Days
Shipping
120+ Countries
Warranty
3-12 Months
Compatible Brands
Matched-Set Dispatch — every V-belt, tensioner, and pulley component for your Cummins N14 or NT855 rebuild ships together so the engine bay never waits on a missing accessory drive item.
| Parameter | Value |
|---|---|
| Part Number | 178509 |
| Product Type | Belt |
| Cross-Reference | 76107717 (reference only) |
| Machine Fitment | N14 MECHANICAL, NH855, NT855, NH220, NH250, NTA855 |
| Design Type | CX profile V-belt |
| Top Width | 22 mm |
| Effective Length | 1147 mm (1060 mm inside length) |
| Material | High-quality rubber with embedded polyester cords |
| Key Features | Heat resistant, oil resistant, wear resistant |
| Condition | New Aftermarket |
| Warranty | 3–12 month warranty against manufacturing defects |
| Standards | ISO 9001 |
| Engine System | Related Components |
|---|---|
| Coolant Circulation | Water pump, thermostat housing, coolant hoses |
| Electrical Charging | Alternator, mounting brackets, wiring harness connectors |
| Engine Cooling Fan | Fan hub, fan blade assembly, fan guard |
| Accessory Drive | Belt tensioner, idler pulley, crankshaft pulley |
| Front Cover Sealing | Front crankshaft seal, timing cover gasket set |
A broken V-belt engine replacement rebuild is rarely the whole story — the real failure usually lives in the driven accessories.
When a CX profile belt like part 178509 snaps on an NH855 or NTA855, the knee-jerk reaction is to swap the belt and restart. In our Shandong rebuild circles, I have watched mechanics do exactly that, only to see the new belt shred within a fortnight because a seized water pump bearing or a glazed crankshaft pulley was never inspected. The belt is the messenger, not the culprit [NEED_CITE: common accessory drive failure modes in heavy-duty diesel engines]. Addressing a V-belt engine replacement rebuild without checking the full accessory drive train invites a repeat failure that costs more in teardown labor than a systematic diagnosis would have.
This V-belt engine replacement rebuild component sits at the front of the Cummins N14 MECHANICAL and NT855 power plant, wrapping around the crankshaft pulley to transfer rotational energy to the water pump, alternator, and cooling fan. During a top-end or full overhaul, the belt drive system should be treated as a matched set. Pulling the old belt without noting the condition of pulley grooves and tensioner spring force means the replacement inherits whatever imbalance killed its predecessor.
When the engine is on the stand, the front cover is off and the timing gear train is exposed, that is the moment to address every accessory drive component. Installing a fresh V-belt engine replacement rebuild part after the engine is back in the chassis and the radiator is reconnected turns a five-minute job into a half-day struggle. Planning the belt drive refresh alongside front seal and timing cover gasket replacement keeps the workflow logical and avoids rework [NEED_CITE: recommended engine overhaul sequencing for inline-six diesel platforms].
The CX profile designation means the belt cross-section measures 22 mm across the top and wedges into sheave grooves cut to that same geometry. A narrower profile would sit too deep and slip under load; a wider one would ride high and wear the sidewalls. The 1147 mm effective length must match the combined pitch circumference of every pulley in the loop — even a few millimeters of deviation forces the tensioner to its travel limit. Polyester cords carry the tensile load and resist stretch at sustained operating temperatures, while the rubber compound resists the oil mist and radiant heat typical of an N14 or NH250 engine compartment. Get any of these three parameters wrong and the belt will either squeal on startup or delaminate after a few hundred hours.
Ordering a replacement belt in isolation — without the matching tensioner, without verifying pulley face condition, without checking whether the water pump shaft shows radial play — sets up a scenario where the engine is torn back down for the same complaint. In the workshops I have supported, this kind of incomplete V-belt engine replacement rebuild approach adds days of labor and erodes customer trust. The root cause was always adjacent to the belt, never the belt alone [NEED_CITE: diagnostic protocols for repeated accessory belt failures in off-highway engines].
Our production lines and qualified sourcing partners cover belt drive components alongside gasket kits, bearing shells, and piston assemblies, all under one account and one warranty. A single inquiry for the V-belt plus tensioner, idler, and front seal ships as one consignment from our Guangzhou warehouse. Minimum order is one piece, so a single emergency rebuild is never blocked by volume requirements. Cross-reference verification catches superseded numbers — such as the 76107717 (reference only) interchange — before the wrong profile ships. Sample belts are available for fitment confirmation before you commit a fleet overhaul order.
Send the full Cummins engine model designation, serial number, and any previous rebuild records so we can confirm the correct belt drive configuration for your specific build. If pulleys or tensioners are part of the scope, include their condition notes or photographs for a matched-set quote.
Q: What other belt drive components should I replace along with this V-belt during an engine rebuild? A: Inspect the tensioner assembly, idler pulley, crankshaft pulley, and water pump shaft bearing. Any component showing play, surface glazing, or corrosion should be replaced in the same order to prevent the new belt from inheriting the same failure mode.
Q: My Cummins N14 has been rebuilt before — how do I confirm the correct belt for my engine serial? A: Provide the engine serial number and any build sheet or rebuild records you have. Production variants across N14 MECHANICAL and NTA855 runs sometimes use different pulley arrangements, and we cross-reference your serial against known configurations before shipping.
Q: Do you supply a complete belt drive kit for the NT855 engine? A: Yes, we can bundle the V-belt with the matching tensioner, idler pulley, and front cover seal in one shipment. Specify which driven accessories are present on your engine so the kit covers every component in the belt loop.
Q: What typically causes premature V-belt failure on these Cummins engines? A: Seized water pump bearings, worn tensioner springs, and pulley misalignment are the most common root causes. The belt itself is usually a symptom, so diagnosing accessory condition before replacement prevents repeat failures [NEED_CITE: accessory drive diagnostic checklist for heavy-duty diesel rebuilds].
Q: Can I get a sample belt to verify fitment before committing to a bulk order? A: Sample supply is available for fitment confirmation. We ship a single unit so your shop can check pulley engagement and length on the actual engine before releasing a production order for a fleet overhaul.
<p>Overhaul kit contents verified item by item before dispatch.</p>
View Details<p><strong>Belt Tensioner 87326910 J914086, forged steel housing with sealed IP65 bearings</strong> — replacement for CASE excavator, loader, and dozer engines across CX, 580, 680, 850, and 888 series.</p> <ul> <li>Operates within the <strong>engine belt drive system</strong>, maintaining correct fan, alternator, and coolant pump belt tension during rebuild</li> <li>Matched sets available with pulleys and belts to address root-cause slippage or overheating faults</li> <li>Spring rated to 1.2 million cycles; pivot shaft held to ±0.02 mm tolerance for consistent preload</li> <li>Fits CASE engine variants including 4390, 4391, 6590, and 6830T families</li> </ul> <p>Overhaul kit contents verified item-by-item against your specific engine build before dispatch.</p>
View Details<p><strong>M174096 Clutch Drive Belt for John Deere Gator XUV 825i, 855D, Yanmar 3TNV70 Engine</strong> — replacement for use in the engine power-transfer circuit linking output to transmission.</p> <ul> <li>Pairs with tensioners, pulleys, and seals as a matched set to prevent premature re-failure from uneven wear or misalignment</li> <li>Cross-reference numbers include M158189, M173005, UC33933, and 31C4573 for verification across Gator XUV generations</li> <li>Fits 825i, 825E, 825M, 835E, 835M, 835R, 855D, 855M, 865E, 865M, 865R and S4 variants</li> </ul> <p>Overhaul kit contents verified item-by-item before dispatch to match your engine build requirements.</p>
View Details<p><strong>MIU13962 V-Belt, EPDM Rubber + Reinforced Polyester Cord</strong> — aftermarket belt drive component compatible with Yanmar 3TNV70 and John Deere Gator XUV series engines.</p> <ul> <li>Rated for continuous 150°C operation, addressing heat-induced cracking typical in standard NBR/SBR belts under engine bay loads</li> <li>Polyester cord geometry follows specified lay angle for uniform load distribution across matched pulleys and tensioners</li> <li>Designed as part of a system-level belt drive supply: paired tensioners, idler pulleys, and fan pulleys ship together to renew the complete front-end accessory drive in one overhaul cycle</li> <li>Cross-reference verification covers superseded numbers found in older Yanmar 3TNV70 service manuals</li> </ul> <p>Overhaul kit contents verified line-by-line before dispatch — matched belt, tensioner, and pulley sets ship as one confirmed consignment.</p>
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