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Product Advantage
WHST40-07 Assignment Plate, also known as valve plate / control plate, is a core precision friction component inside the World Harvester 45CC HST hydraulic pump motor assembly. It works in close contact with the cylinder block to distribute high-pressure hydraulic oil, controlling the forward, reverse and variable speed walking power output of the World Harvester combine harvester.
During long-hour harvesting operations, the assignment plate endures continuous high pressure, friction and oil impact. Worn, scratched or deformed assignment plates will cause HST power drop, walking weakness, unstable speed, hydraulic oil overheating and internal leakage. Replacing with our WHST40-07 assignment plate restores the original hydraulic performance of the HST unit, prevents sudden breakdown in busy harvest season and cuts maintenance downtime.
Our WHST40-07 assignment plate is manufactured from high-grade alloy steel with precision grinding and heat treatment. The flatness and surface roughness are strictly controlled to meet OEM tolerance. It features excellent wear resistance, high compressive strength and anti-scuffing performance. Stable friction surface ensures uniform oil distribution, reduces internal leakage and extends the service life of matched HST plungers and cylinder block. It is a direct bolt-on replacement without extra modification.
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Oil distribution Accurately switch the high and low pressure oil circuits of the motor to ensure stable output torque of the plunger motor. | Reduce internal leakage High precision distribution surfaces effectively reduce leakage and improve walking efficiency. | Ensure stable power output Keep the harvester stable and powerful in working conditions such as mud, paddy fields, and slopes. | Extend HST lifespan Protect key components such as cylinder body and plunger, reduce wear and oil temperature rise |
Technical Parameters
| ITEMS | DESCRIPTION |
| Name | Assigment Plate(Motor) |
| Code | WHST40-07 |
| Weight | 0.15 1 piece/set |
| Size(mm) | Φ90 φ:28 H:5 |
Product Uses
Replacement and repair of World Harvester HST hydraulic walking system. Ideal for agricultural machinery repair workshops, spare parts wholesalers and large farm fleets. Bulk purchasing helps maintain sufficient inventory for peak harvest maintenance.
Product Operate Guide
Typical issues suitable for inspection/replacement
1.Slow walking speed and decreased power
2.Significant weakness after heating up the car
3.Abnormal noise in HST system
4.The return oil volume at the motor end has significantly increased
5.Upon disassembly and inspection, it was found that there were burn marks, pull marks, and pressure marks on the distribution plate surface
Q: Which harvester models does WHST40-07 assignment plate fit?
A: It matches World Harvester combine harvesters equipped with 45CC HST unit, including 4LZ-6.0P, AW70, AW82, AW85. Please provide your machine serial number or old part number for double confirmation.
Q: What symptoms indicate a failed HST assignment plate?
A: Common signs: harvester walking power loss, unstable speed, HST oil temperature rising rapidly, internal hydraulic leakage and noisy HST pump motor.
Q: Can I mix this item with other World Harvester HST parts in one bulk order?
A: Yes, mixed orders of WHST40 series HST spare parts, rollers, bearings and transmission parts are welcome.
Q: What is your delivery time?
A: In-stock items ship within 3–7 working days. Large bulk orders take 15–25 working days.
Product Video
