The genuine XCMG 800370370 Hose is a heavy‑duty hydraulic hose assembly engineered for XCMG GR series motor graders.
This OEM hose is specifically designed for low‑pressure return lines, transmission oil cooling circuits, and tank‑to‑pump suction applications where reliable fluid transfer is critical.
Constructed with a synthetic rubber inner tube, textile or light steel wire reinforcement (depending on pressure rating), and an oil/weather/abrasion‑resistant cover.
The 800370370 hose safely conveys hot transmission fluid (ATF) and hydraulic oil at temperatures from -40°C to +125°C and working pressures up to 3.5 MPa (35 bar).
The assembly includes factory‑crimped end fittings in straight or pre‑formed shapes, enabling direct replacement on GR135, GR165, GR180, GR215, GR260, GR300, GR350, and GR2003 motor graders.
The 800370370 hose is typically used for the return line from the torque converter to the oil cooler and from the cooler back to the transmission sump.
It must resist heat ageing, chemical attack from ATF, and external abrasion. The hose construction meets SAE 100R4 or SAE 100R6 standards, providing excellent vacuum resistance and flexibility.
The cover is pin‑pricked to allow gas permeation and prevent blistering. Each hose assembly is proof‑tested to 7 MPa and crimped using traceable tooling.
A leaking or collapsed transmission cooler hose can cause overheating, oxidation of ATF, and eventual transmission failure.
Replacing a worn hose with genuine XCMG 800370370 restores proper oil flow, prevents overheating, and extends transmission life.
Keep this hose assembly in your parts inventory for rapid repair of cooling system leaks.
| Parameter | Specification |
|---|---|
| OEM Number | 800370370 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Low‑Pressure Hydraulic / Transmission Oil Hose |
| Hose Length (overall) | 890 mm (±6 mm) |
| Inside Diameter (ID) | 19.0 mm (‑12 dash size / 3/4″ nominal) |
| Reinforcement | Textile braid with spiral wire (for vacuum resistance) |
| Tube Material | Synthetic rubber (oil resistant NBR) |
| Cover Material | Synthetic rubber – abrasion, ozone, weather resistant |
| End Fittings | Steel, zinc‑plated; both ends straight (or pre‑formed 90° elbow) |
| Fitting Thread Type | G 1″ BSPP (female swivel) or SAE J514 ORB |
| Working Pressure (max.) | 3.5 MPa (35 bar / 507 psi) |
| Proof Pressure | 7.0 MPa (70 bar / 1,015 psi) |
| Burst Pressure (min.) | 14.0 MPa (140 bar / 2,030 psi) |
| Minimum Bend Radius | 160 mm |
| Temperature Range (fluid) | -40°C to +125°C (-40°F to +257°F) |
| Fluid Compatibility | Mineral oil, ATF, diesel, coolant, water‑glycol |
| Standards Compliance | SAE 100R4, ISO 3949, XCMG Q/XCMG 1115-2023 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, GR2003 |
| Superseded Part Numbers | 800369901, 800370200, 800370315, 800370365 |
The 800370370 hose is an essential part of the grader’s transmission oil cooling system.
It carries hot ATF from the torque converter outlet to the oil cooler (radiator) and then returns the cooled fluid to the transmission sump.
Without proper flow, the transmission overheats, leading to clutch slippage and seal failure.
This hose also serves as a low‑pressure return line from hydraulic cylinders to the tank.
In such applications, it must resist collapse under vacuum when oil returns quickly.
The textile‑and‑wire reinforcement of the 800370370 hose prevents suction collapse, ensuring smooth return flow and avoiding pump cavitation.
A cracked, swollen, or internally delaminated hose can restrict flow, causing transmission overheating and accelerated wear.
Replacing a degraded hose with genuine XCMG 800370370 restores proper cooling capacity and protects the transmission from thermal damage.
During routine transmission oil changes, inspect these hoses carefully.
XCMG builds the 800370370 hose using a multi‑layer process optimized for low‑pressure, high‑temperature oil service.
The inner tube is made from a premium NBR compound that resists swelling and extractive loss when exposed to hot ATF (up to 125°C).
Over the tube, a textile braid and a spiral steel wire are applied to provide collapse resistance and flexibility.
The cover is a synthetic rubber that passes 200 cycles on a Taber abraser and 500 hours in an ozone chamber without cracking.
The hose is cured in a long autoclave for uniform cross‑linking.
The cover is pin‑pricked (perforated) to allow trapped gases to escape, preventing blistering under high temperature.
Each length is proof‑tested to 7.0 MPa and inspected for dimensional accuracy.
The end fittings are crimped using dedicated tooling with controlled crimp diameter.
Random samples are flex‑tested and vacuum‑tested (−0.09 MPa) to ensure no collapse.
XCMG’s quality system ensures each 800370370 hose meets SAE 100R4/ISO 3949 requirements for superior reliability.
When replacing an old transmission cooler hose, first cool the system and relieve pressure.
Drain oil as needed. Disconnect the old hose and inspect the ports on the cooler, torque converter, and sump.
Replace any missing or damaged O‑rings or gaskets that come with the new hose.
Route the new 800370370 hose without twisting, kinking, or sharp bends.
Maintain a minimum bend radius of 160 mm. Use rubber chafe guards where the hose contacts frame edges.
Tighten the swivel fittings hand‑tight plus ½ turn with a wrench. Do not over‑tighten; the O‑ring provides the seal.
After installation, refill ATF to the correct level, start the engine, and check for leaks while the transmission reaches operating temperature.
Inspect the hose again after 1 hour of operation.
Keep spare 800370370 hoses in your shop – a sudden cooler hose burst can empty the transmission in seconds, causing immediate overheating and expensive damage.
Aftermarket low‑pressure hoses often use inferior rubber that hardens and cracks due to heat and ozone within 12–18 months.
Many lack the spiral wire reinforcement, causing the hose to collapse under suction, starving the transmission cooler and leading to overheating.
Genuine XCMG hoses are designed for the specific flow and temperature demands of GR graders.
Counterfeit hoses may have incorrect inner diameters, restricting flow and causing excessive back pressure in the cooler circuit.
Some use cheap rubber that swells when in contact with hot ATF, further reducing flow.
Genuine XCMG hoses are dimensionally verified and made from virgin NBR compounds that resist swelling.
The crimped fittings are consistently sealed, avoiding leaks.
XCMG provides a 12‑month warranty against manufacturing defects.
The small additional cost of an OEM hose is far outweighed by the cost of a transmission rebuild due to overheating.
For cooling circuits, only genuine parts ensure the correct performance and longevity. Choose 800370370 for peace of mind.
Visual signs: outer cover cracking (weather checking), bulging, soft spots, oil weeping at the fittings, or a flattened appearance indicating internal collapse.
Also, if the hose feels hard and inflexible, the rubber has aged and lost elasticity.
A transmission cooler hose may show internal swelling visible as a reduction in ID.
Preventive replacement is recommended every 3,000 operating hours or every 3 years.
During each 1,000‑hour service, inspect all cooler and return hoses under operating temperature.
Squeeze the hose – it should feel firm but slightly pliable. A rock‑hard hose must be replaced.
Keep a stock of 800370370 hoses in your fleet inventory.
When replacing a transmission cooler, always install a new hose.
Hoses that have been subjected to repeated heat cycles will have lost elasticity.
A proactive replacement schedule prevents sudden hose bursts and unplanned transmission overhauls.
The XCMG 800370370 Hose Assembly is stocked in regional distribution centers: Houston (USA), Rotterdam (Netherlands), Dubai (UAE), and Shanghai (China).
Standard air freight delivers within 2–5 business days worldwide.
Expedited courier (DHL/FedEx) provides 1–2 day shipping for emergency transmission cooling repairs.
Bulk orders of 10+ hoses receive volume discounts and can be shipped by sea freight.
Each hose is individually packed in a sealed plastic bag and boxed to prevent damage.
For large fleets, consignment stock programs ensure immediate availability.
Our parts specialists can help identify the correct hose routing and fitting orientation for your specific grader model.
Don’t risk transmission overheating due to a degraded cooler hose.
Order the genuine XCMG 800370370 Hose today and restore proper oil flow and cooling capacity to your motor grader.
This hose is a key component in maintaining transmission health – only OEM quality guarantees the reliability you need.
Upgrade your grader’s cooling system reliability with XCMG genuine hoses.
Engineered for high‑temperature flexibility, vacuum resistance, and long service life.
Use the buttons above to request a quote or email our parts specialists.
Keep your XCMG grader’s transmission cool and protected – choose 800370370 OEM hose.
