ZF 0634.303.340 O-RING
ZF Part Number: 0634.303.340 (also written as 0634303340 / 0634.303.340 / 0634 303 340)
Compatible ZF Transmission Models
This o-ring is used in the following ZF transmission models:
- ZF 4 WG 150
- ZF 4 WG 180(500)
- ZF 4 WG 200
- ZF 4 WG 200(555)
- ZF 4 WG 200(555/5)
- ZF 6 WG 180(500)
- ZF 6 WG 200
- ZF 6 WG 200(500)
- ZF 6 WG 200(555)
Part Location in Assembly
| Section | Position No. | Qty |
|---|---|---|
| Pump Drive | 340/020 | 2 |
| Pump Drive | 480/020 | 2 |
| Speedometer | 110 | 1 |
| Transmission Housing | 01.730 | 2 |
| Transmission Housing | 730 | 2 |
| Transmission Housing | 762 | 2 |
Related Parts in Same Assembly
- 5838.300.288 — CLUTCH BELL HOUSING (Qty: 1)
- 0501.222.007 — VALVE BLOCK (Qty: 1)
- 0501.325.280 — SOLENOID VALVE (Qty: 1)
- 0501.327.379 — O-RING (Qty: 1)
- 0501.327.378 — O-RING (Qty: 1)
- 0501.327.380 — O-RING (Qty: 1)
- 0501.327.381 — SCREW (Qty: 1)
- 0750.117.075 — TAPER ROLLER BEARING (Qty: 2)
Frequently Asked Questions
What is ZF part number 0634.303.340?
ZF 0634.303.340 is an OEM o-ring 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 150, 4 WG 180(500), 4 WG 200, 4 WG 200(555), 4 WG 200(555/5). This is a genuine ZF component, not an aftermarket reproduction.
Which ZF transmissions use 0634.303.340?
This o-ring is found in 9 ZF transmission variants, including: 4 WG 150, 4 WG 180(500), 4 WG 200, 4 WG 200(555), 4 WG 200(555/5), 6 WG 180(500), 6 WG 200, 6 WG 200(500), 6 WG 200(555). 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 0634.303.340 installed in the transmission?
This o-ring is located in the pump drive area of the transmission. It appears in 30 different assembly configurations. In the service manual, look for position number 340/020 in the Pump Drive section.
How do I look up ZF part 0634.303.340?
This part can be found under several formats: 0634303340 / 0634.303.340 / 0634 303 340. 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 (0634.303.340).
When should I replace ZF 0634.303.340?
Replace this seal during every transmission overhaul or if you notice oil leakage at the seal location. Seals are wear items and should not be reused after removal.
Can I reuse ZF 0634.303.340 after disassembly?
No. ZF recommends always installing new seals during reassembly. Reusing seals may result in leaks and premature failure.
Where can I buy ZF 0634.303.340?
You can purchase genuine ZF 0634.303.340 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 0634.303.340 is located within the transmission assembly.
