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The WEICHAI WP12 Crankshaft Pulley Group is a precision-engineered harmonic balancer that mounts to the front of the crankshaft in WP12 diesel engines. It drives all accessories via the serpentine belt. As genuine WEICHAI Engine Parts, this pulley group reduces destructive torsional vibrations and ensures smooth accessory drive operation across all WP12 variants from 336 HP to 550 HP.
The WEICHAI WP12 Crankshaft Pulley Group is a bonded rubber harmonic balancer bolted to the crankshaft snout. It drives the alternator, power steering pump, water pump, AC compressor, and air compressor via a multi-rib serpentine belt. The assembly consists of an inner hub, an outer inertia ring, and a vulcanized rubber isolator.
The rubber isolator absorbs torsional vibrations from engine combustion pulses, converting destructive energy into heat. This damping protects the crankshaft, main bearings, and accessory drive components from fatigue failure. The outer ring carries precision-ground grooves that match the serpentine belt profile.
Manufactured from QT500-7 nodular cast iron (outer ring) and forged alloy steel (hub), the WEICHAI WP12 Crankshaft Pulley Group is dynamically balanced to G6.3 grade with maximum residual unbalance of 30 g·mm. The bonded EPDM rubber withstands continuous 120°C engine compartment temperatures.
Applications include Shacman X3000/F3000, Sinotruk HOWO A7, Dongfeng KL, SDLG wheel loaders, XCMG excavators, marine WP12C, and generator sets. Multiple OEM part numbers exist: 1144111-00585-001, 612630020218, 612630020178, and 612630020215 for various belt configurations (6-rib, 8-rib, or 10-rib).
Counterfeit pulleys lack proper rubber bonding and harmonic damping, leading to premature failure, crankshaft damage, and accessory drive issues. Always source genuine WEICHAI WP12 Crankshaft Pulley Group from authorized distributors to ensure material traceability and correct vibration damping characteristics.
| NO. | Part NO | Description |
|---|---|---|
| 1 | 1144111-00585-001 | Complete Crankshaft Pulley Group (Harmonic Balancer Assembly) |
| 2 | 1144111-00499-001 | Crankshaft Pulley Assembly (WP12/WD12/WD618 Compatible) |
| 3 | 612630020218 | Crankshaft Pulley Assembly (WP12/WP13, 381HP-550HP) |
| 4 | 612630020178 | Crankshaft Pulley (Standard Duty, 6/8-Rib Belt) |
| 5 | 612630020215 | Crankshaft Pulley (Heavy-Duty, Severe Service) |
| 6 | 612630020203 | Torsional Vibration Damper (Rubber Isolator Only) |
| 7 | 612600020692 | Crankshaft Pulley (OEM Universal, D280×D46×H45mm) |
| 8 | 612630020038A | Crankshaft Assembly (with Pulley Hub Mounting Surface) |
| 9 | 612600061464 | Multi-Rib Serpentine Belt (WP10/WP12 Replacement) |
The table above lists common service parts for the WEICHAI WP12 Crankshaft Pulley Group. Always replace the central bolt (torque-to-yield) and inspect the Woodruff key when installing a new pulley. The outer diameter ranges from 180-280mm; groove count varies from 6 to 10 ribs depending on accessory load.
Our pulley uses a bonded rubber isolator to cancel torsional vibrations, reducing crankshaft stress by up to 60% compared to solid pulleys. This extends engine B10 life to 1,800,000 km.
Each WEICHAI WP12 Crankshaft Pulley Group is balanced to G6.3 grade with residual unbalance ≤30 g·mm, eliminating vibration at all engine speeds from idle to 2100 RPM.
QT500-7 nodular cast iron outer ring (500 MPa tensile) and forged alloy steel hub ensure durability under 2,300 N·m torque. Induction-hardened keyway resists wear.
No modifications required for WP12 engines in Shacman, Sinotruk, Dongfeng, SDLG, XCMG, marine, or generator applications. Bolt-on with central bolt torque: 200 N·m + 60°-90°.
Every unit undergoes dimensional inspection, dynamic balancing, rubber bond integrity testing, and runout verification (≤0.2mm). IATF 16949 certified.
Worldwide shipping from regional warehouses. Free torque charts, Woodruff key alignment guides, and troubleshooting included. Volume discounts available.
Unlike cheap alternatives, our pulley uses certified QT500-7 material and high-temperature EPDM rubber. Testing confirms over 10 million torsional cycles without rubber separation. The outer surface is phosphate-coated for corrosion resistance in marine and high-humidity environments.
Each hub is forged and CNC-machined with keyway tolerance +0.01mm. Grooves are ground to ISO 9981 PK-profile with ±0.05mm spacing and RA 1.6 μm finish, ensuring optimal belt grip and minimal wear.
Technical support includes installation procedures: clean crankshaft snout, align Woodruff key, apply thread locker to new central bolt, torque to 200 N·m + 60°-90° angle, and verify runout ≤0.2mm. Troubleshooting guides for belt squeal, pulley wobble, and vibration are provided.
For fleets, sample testing is available. Order one WEICHAI WP12 Crankshaft Pulley Group for trial; volume pricing applies. Many customers report over 800,000 km trouble-free operation. We stock both 6-rib and 8/10-rib variants.
Also monitor battery charge warning light and power steering assist. If charging light flickers at idle or steering becomes heavy at low RPM, the pulley may be slipping due to worn grooves or low belt tension.
For severe-duty applications (mining, marine, heavy haul), reduce inspection interval to every 25,000 km or 250 hours. Marine applications require additional corrosion checks; apply inhibitor coating as needed.
If the pulley separates or fails, inspect the crankshaft snout for keyway damage and runout (max 0.05mm). Replace front crankshaft seal (612630010106) to prevent oil contamination of the new pulley rubber.
Maintain a logbook: record rubber condition photos, runout readings, bolt torque verification, and belt replacements. Tracking crack propagation helps predict replacement needs. Proactive replacement at 500,000 km is strongly recommended.
In summary, the WEICHAI WP12 Crankshaft Pulley Group features bonded rubber harmonic damping, G6.3 dynamic balancing, and QT500-7 outer ring construction. Always verify part numbers against engine serial number and belt configuration (6, 8, or 10 ribs). Common OEM references: 1144111-00585-001, 612630020218, and 612630020178.
For workshops, order a complete front-end accessory drive kit including the pulley, central bolt, Woodruff key, serpentine belt (612600061464), tensioner, and idler pulleys. This eliminates hidden failures and ensures customer satisfaction.
We stock standard-duty (612630020178) and heavy-duty (612630020215) variants. Heavy-duty version features enhanced rubber compound for higher temperature resistance and thicker outer ring for mining and marine applications. Contact us for part number verification.
After-sales documentation includes dimensional reports, dynamic balance certificates, material certificates (QT500-7 and forged alloy steel), rubber compound specs, and torque instructions. Every unit is packed in anti-corrosion foam-lined crates. Bulk orders receive custom palletizing.
All specifications based on original WEICHAI WP12 data. Cross-check part numbers with engine serial number. The WEICHAI WP12 Crankshaft Pulley Group replaces 1144111-00585-001, 1144111-00499-001, 612630020218, 612630020178, 612630020215. Always use new central bolt, torque to 200 N·m + 60°-90°, and verify runout ≤0.2mm.
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