ZF 4644.308.637 IDLER GEAR
ZF Part Number: 4644.308.637 (also written as 4644308637 / 4644.308.637 / 4644 308 637)
Compatible ZF Transmission Models
This idler gear is used in the following ZF transmission models:
- ZF 4 WG 158
- ZF 4 WG 180
- ZF 4 WG 180(555)
- ZF 4 WG 200
- ZF 4 WG 200(555)
- ZF 4 WG 200(555/5)
Part Location in Assembly
| Section | Position No. | Qty |
|---|---|---|
| Countershaft | 090 | 1 |
Related Parts in Same Assembly
- 4644.301.228 — TRANSMISSION HOUSING (Qty: 1)
- 4475.280.023 — SCREW PLUG (Qty: 1)
- 0730.365.067 — TYPE PLATE (Qty: 1)
- 0631.311.009 — GROOVED STUD (Qty: 4)
- 4644.301.298 — COVER PLATE (Qty: 1)
- 4644.301.192 — COVER PLATE (Qty: 1)
- 0636.015.278 — HEXAGON SCREW (Qty: 3)
- 0630.001.012 — WASHER (Qty: 3)
Frequently Asked Questions
What is ZF part number 4644.308.637?
ZF 4644.308.637 is an OEM idler gear produced by ZF Friedrichshafen AG, one of the world’s largest automotive suppliers. It is designed for use in ZF powershift transmissions, specifically in models such as 4 WG 158, 4 WG 180, 4 WG 180(555), 4 WG 200, 4 WG 200(555). This is a genuine ZF component, not an aftermarket reproduction.
Which ZF transmissions use 4644.308.637?
This idler gear is found in 6 ZF transmission variants, including: 4 WG 158, 4 WG 180, 4 WG 180(555), 4 WG 200, 4 WG 200(555), 4 WG 200(555/5). These transmissions are commonly used in wheel loaders, graders, and other heavy construction equipment. Contact us to verify fitment for your specific machine.
Where is ZF 4644.308.637 installed in the transmission?
This idler gear is located in the countershaft area of the transmission. It appears in 30 different assembly configurations. In the service manual, look for position number 090 in the Countershaft section.
How do I look up ZF part 4644.308.637?
This part can be found under several formats: 4644308637 / 4644.308.637 / 4644 308 637. All formats refer to the same genuine ZF component. When ordering, any of these numbers will work. The official ZF catalog uses the dotted format (4644.308.637).
How do I inspect ZF 4644.308.637?
Inspect gear teeth for pitting, spalling, cracks, and abnormal wear patterns. Check tooth contact pattern using marking compound. Replace if damage exceeds ZF service limits.
Where can I buy ZF 4644.308.637?
You can purchase genuine ZF 4644.308.637 from PartsZF.com (operated by Tianjin Xiaohang Construction Machinery Co., Ltd). We maintain direct supply channels with ZF and offer worldwide shipping. Contact our parts specialists for current pricing and lead times.
Need this part? Contact our ZF parts specialist for pricing and availability. We ship worldwide with OEM quality guarantee.
Exploded View / Assembly Diagram
The diagram below shows where ZF 4644.308.637 is located within the transmission assembly.
