Overview
The ZF 0632.702.803 HOSE PIPE is a critical fluid transfer component engineered specifically for the WG 65 Series transmission family. This OEM genuine part channels pressurized hydraulic oil between the valve body and the cooler circuit, ensuring consistent lubrication and thermal regulation within the gearbox. As a direct-fit replacement, the SKU 0632.702.803 eliminates guesswork during rebuilds or preventative maintenance. Proper installation of this hose pipe prevents pressure drops that can compromise shift quality, and it works in concert with the 4616101111: TRANSMISSION HOUSING to maintain a sealed hydraulic loop. Without this component, the transmission cannot sustain the oil flow required for clutch pack engagement and torque converter lockup.
Symptoms of Failure
- External hydraulic oil leaks near the transmission cooler lines – A cracked or swollen hose pipe often drips ATF fluid, leaving puddles under the vehicle and causing low oil levels.
- Erratic gear engagement or delayed shifting – When the hose pipe collapses internally or develops a pinhole leak, hydraulic pressure drops, leading to soft shifts or slipping between gears.
- Overheating transmission fluid – Restricted flow through a degraded hose pipe reduces cooler circulation, causing the transmission to run hotter than normal and triggering warning codes.
- Whining or groaning noises from the pump – Air ingestion through a compromised hose pipe aerates the fluid, producing audible cavitation sounds from the hydraulic pump.
Technical Specifications
| Part Number | 0632.702.803 |
| Product Type | HOSE PIPE (Hydraulic Fluid Line) |
| Material | Reinforced synthetic rubber with braided textile layer |
| Inside Diameter | 12.7 mm (0.5 in) |
| Outside Diameter | 21.3 mm (0.84 in) |
| Overall Length | 410 mm (16.1 in) |
| Weight | 0.18 kg (0.40 lbs) |
| OEM Reference | ZF 0632.702.803 |
| Operating Pressure | Up to 18 bar (261 psi) |
| Temperature Range | -40°C to +135°C (-40°F to +275°F) |
Compatibility
This hose pipe is designed for the ZF WG 65 Series, but it also fits several other ZF off-highway and industrial transmissions that share the same hydraulic routing architecture. Compatible models include the WG65, WG80, WG120, WG180, and WG200 series. It is commonly used in forklifts, wheel loaders, and telehandlers. When replacing this part, always inspect the adjacent 0636011118: HEXAGON SCREW and the 4616301304: HOUSING for corrosion or thread damage. Additionally, verify the sealing surfaces on the 4616301309: HOUSING to prevent future leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101111 | TRANSMISSION HOUSING | Main structural casing that encloses gears and shafts |
| 0636011118 | HEXAGON SCREW | Fastener securing housing and valve body assemblies |
| 4616301304 | HOUSING | Intermediate housing for clutch pack support |
| 4616301309 | HOUSING | Rear housing adapter for output flange |
| 0636011038 | HEXAGON SCREW | Bolt for oil pan and filter cover |
| 0636016015 | HEXAGON SCREW | High-tensile fastener for bell housing |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for precision assembly |
| 0634313118 | O-RING | Seal between hose pipe and cooler fitting |
| 0636304019 | SCREW PLUG | Closure for test ports and drain holes |
| 0634801152 | SEALING RING | Copper washer for banjo bolt connections |
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