The genuine XCMG 860179276 Expansion Valve is a thermostatic expansion valve (TXV) designed for motor grader air conditioning evaporators. This OEM 860179276 valve precisely meters liquid refrigerant into the evaporator core, controlling superheat for optimal cooling performance.
Manufactured from corrosion‑resistant brass with an internal diaphragm and sensing bulb, it automatically adjusts refrigerant flow based on evaporator outlet temperature, preventing liquid slugging and evaporator freeze‑up.
Engineered for XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders, this expansion valve is a direct replacement for original equipment with identical mounting, port sizes, and pressure ratings.
A sticking or incorrectly sized expansion valve causes poor cooling, evaporator icing (blocked airflow), or compressor damage due to liquid refrigerant return. Replacing a faulty valve with genuine XCMG 860179276 restores proper superheat control and system efficiency.
This valve is externally equalized, ensuring accurate superheat measurement regardless of pressure drop across the evaporator. It is compatible with R134a and R1234yf refrigerants and includes factory pre‑adjusted superheat setting (typically 5‑7°C).
The sensing bulb is charged with a cross‑charged or liquid‑charged fill for stable control across a wide temperature range. XCMG 860179276 guarantees OE fit and long‑term reliability.
| Parameter | Specification |
|---|---|
| OEM Number | 860179276 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Thermostatic Expansion Valve (TXV) |
| Body Material | Brass (forged) with nickel plating |
| Refrigerant Compatibility | R134a, R1234yf (original charge for R134a) |
| Orifice Size / Capacity | 2.5 tons nominal (30,000 BTU/h) |
| Superheat Adjustment (Factory) | Fixed, external equalizer (bulb charge type: cross‑charged) |
| Equalization Type | External (¼ inch flare connection) |
| Inlet Port Size | #8 O‑ring female (M18×1.5) |
| Outlet Port Size | #6 O‑ring female (M16×1.5) |
| Sensing Bulb Type | Remote, strapped to suction line (adjustable position) |
| Bulb Fill | Cross‑charged (MOP – maximum operating pressure protection) |
| Maximum Operating Pressure (Refrigerant) | 3.5 MPa (500 psi) |
| Operating Temperature Range | -40°C to +110°C (bulb: -40°C to +70°C for stable sensing) |
| Fluid Compatibility | PAG46, PAG100, Ester oil (mineral oil not recommended) |
| Standards | ISO 14903, SAE J1605 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 |
| Superseded Part Numbers | 860179250, 860179268, 860179270 |
The 860179276 expansion valve is the metering device that controls the amount of liquid refrigerant entering the evaporator. It maintains a constant superheat by sensing the evaporator outlet temperature via the remote bulb.
If the superheat is too high (insufficient refrigerant), the evaporator will be starved, causing poor cooling. If superheat is too low (excessive refrigerant), liquid refrigerant can return to the compressor, causing slugging and internal damage.
A stuck or erratic valve will result in evaporator icing, warm air, or compressor cycling. Replacing a failed valve with genuine XCMG 860179276 restores precise refrigerant control, full cooling capacity, and compressor safety.
The external equalizer compensates for pressure drop across the evaporator, ensuring accurate superheat measurement and stable operation under varying loads.
Each 860179276 expansion valve is forged from brass, then precision machined to ensure leak‑free sealing. The internal seat and needle are made of stainless steel for wear resistance.
The diaphragm is made of stainless steel with a PTFE coating for corrosion resistance. The sensing bulb is copper with a cross‑charged refrigerant fill that includes MOP (maximum operating pressure) protection to prevent evaporator flooding at high loads.
The valve is factory‑adjusted for a superheat of 5‑7°C at nominal conditions. This setting is non‑adjustable, ensuring consistent performance without field calibration errors.
XCMG leak‑tests every valve at 4.0 MPa with helium and verifies the opening characteristic using a custom test stand. Only valves that meet the flow curve specification are approved.
To replace a faulty expansion valve, recover the refrigerant. Remove the evaporator housing cover and locate the valve at the evaporator inlet/outlet.
Unbolt the liquid line and suction line connections. Remove the sensing bulb from the suction line (do not cut the capillary tube).
Install new O‑rings lubricated with PAG oil. Position the new 860179276 valve, ensuring the sensing bulb is placed on the suction line downstream of the evaporator outlet, with good thermal contact. Secure the bulb with the supplied metal strap.
Torque the liquid line connection to 25 Nm and the suction line to 20 Nm. Install the external equalizer tube (if not already integral) and torque to 12 Nm.
Evacuate the system for 45 minutes, then recharge with the correct refrigerant weight. Run the engine with A/C on high, and verify that the evaporator outlet line is cool but not frosted.
Always replace the receiver‑drier when the system is opened. Keep a spare expansion valve for quick summer repairs.
Evaporator freezing up (ice on the coil), poor cooling despite correct charge, hissing or clicking noise from the valve, compressor short‑cycling, and frost on the suction line near the evaporator outlet.
Also, fluctuating discharge pressure and temperature, or a completely blocked valve causing no refrigerant flow. Replace immediately to avoid compressor damage.
Inspect the expansion valve annually by performing an A/C performance test (suction pressure and superheat measurement). Normal superheat should be 5‑7°C at steady state.
XCMG recommends replacing the expansion valve every 5‑7 years or 6,000‑8,000 hours, whichever occurs first. In dusty or high‑humidity environments, replace every 4,000 hours as a preventive measure.
When replacing the evaporator or compressor, always install a new expansion valve – contaminants from the old system can clog the valve, and the valve’s calibration may drift over time.
Keep the sensing bulb firmly attached to the suction line; a loose bulb will cause superheat errors and poor performance.
Genuine XCMG 860179276 expansion valves are backed by a 12‑month warranty. Regional warehouses: Houston (USA), Rotterdam (Netherlands), Dubai (UAE), Shanghai (China).
Standard air freight delivers within 3‑7 business days worldwide. Express 24‑48 hour shipping available for urgent A/C repairs. Bulk orders (10+ valves) receive volume discounts.
Aftermarket expansion valves often feature incorrect orifice sizes, poor calibration, or inferior diaphragm material, leading to unstable superheat and compressor damage. Genuine XCMG 860179276 ensures proper capacity matched to the GR series evaporator.
Do not attempt to clean or adjust a stuck valve – internal contamination cannot be removed. Keep a genuine spare expansion valve in your parts inventory for rapid field replacement.
Order the genuine XCMG 860179276 Expansion Valve today and maintain accurate refrigerant metering, full cooling capacity, and compressor reliability for your motor grader.
Upgrade your grader’s A/C system precision with XCMG genuine expansion valves – brass body, cross‑charged bulb, and 100% flow‑tested.
