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Product Advantage
The outer rotor and inner rotor are key transmission components of the charge pump in the HST (static hydraulic transmission) system, used to continuously provide stable oil replenishment pressure to the system, ensuring smooth, efficient, and low wear operation of the pump motor.

Technical Parameters
| ITEMS | DESCRIPTIONDESCRIPTION | |
| Name | Charge Pump Gear(Outer) | Charge Pump Gear(Inner) |
| Code | WHST40-13A-02 | WHST40-13A-03 |
| Weight | 0.1 1 piece/set | 0.05 1 piece/set |
| Size(mm) | Φ:60 H:16 | φ:20 Φ:42 H:16 |
Product Uses
Suitable for the World harvester 45cc static hydraulic pump (HST Pump) ,
used for:
Walking Drive System
HST hydraulic circulation oil replenishment
System anti cavitation and pressure stability

Product Operate Guide
Common fault manifestations
(can be placed on the details page if necessary)
Walking weakness/slow acceleration
HST system noise increases
Abnormal increase in oil temperature
Low oil replenishment pressure
(Usually caused by rotor wear and increased mesh clearance)





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