The genuine XCMG 273100577 Breather Plug is an OEM pressure‑relief and contamination‑control device designed for motor grader transmission housings, axle sumps, hydraulic tanks, and final drives. This 273100577 breather plug allows expanding air and oil vapor to escape while blocking dirt, water spray, and abrasive dust from entering the lubricated compartment. Manufactured from corrosion‑resistant brass with an internal sintered bronze filter element, the XCMG 273100577 breather plug prevents pressure buildup that causes seal leakage and keeps lubricants clean.
The 273100577 breather plug is installed on XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. It is typically located on top of the transmission case, rear axle housing, hydraulic oil tank filler neck, and planetary hub covers. A clogged or missing breather plug leads to internal pressure, blown gaskets, or contamination ingress.
Replacing a damaged or clogged breather with genuine XCMG 273100577 maintains correct internal pressure, extends seal and bearing life, and reduces oil contamination. This small component delivers major protection for your grader’s most expensive assemblies.
| Parameter | Specification |
|---|---|
| OEM Number | 273100577 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Breather Plug / Ventilator / Pressure Relief Valve |
| Thread Size | M20 × 1.5 (metric coarse thread) |
| Thread Type | Male, straight (ISO metric) |
| Material – Body | Brass C37700 (leaded brass) / Nickel‑plated steel (optional) |
| Filter Element | Sintered bronze, 40 micron nominal rating |
| Overall Height | 35 mm ±1.0 mm (including cap) |
| Hex Size (Tool) | 24 mm (across flats) |
| Pressure Relief Cracking | 0.35 – 0.70 bar (5 – 10 psi) positive pressure |
| Vacuum Relief (Inhale) | 0.07 bar (1 psi) – prevents vacuum collapse |
| Operating Temperature Range | -40°C to +130°C (continuous) |
| Ingress Protection (IP Rating) | IP65 (dust‑tight, protected against low‑pressure water jets) |
| Flow Capacity (Free Air) | 25 L/min @ 0.7 bar pressure drop |
| Corrosion Protection | Passivated brass or zinc‑nickel plating (salt spray 240h) |
The 273100577 breather plug equalizes internal pressure in gearboxes and hydraulic tanks. As the grader operates, lubricant heats up and expands, creating pressure that can blow out shaft seals or push oil past gaskets.
Without a working breather, the transmission or axle housing may develop leaks at every seal. Conversely, when the machine cools, vacuum forms and can collapse flexible hoses or suck in contaminated air through worn seals.
The sintered bronze filter inside the 273100577 stops airborne dust from entering the oil, preventing abrasive wear on gears and bearings. This single component protects your grader’s entire drivetrain.
Each 273100577 breather plug is machined from solid brass bar stock, then assembled with a stainless steel spring, a PTFE diaphragm, and a sintered bronze filter. The cracking pressure is calibrated using a precision test rig.
The O‑ring groove is precisely formed to provide a leak‑proof seal against the housing counterbore. The external hex allows easy removal with a standard wrench, and the vent holes are positioned to prevent water entry even when splashed.
XCMG tests each batch for flow rate at 0.7 bar and for water ingress (IP65). The filter element is ultrasonically cleaned before assembly to ensure free airflow from the first hour of operation.
Before removal, clean the area around the breather to prevent dirt falling into the housing. Use a 24 mm socket or wrench to unscrew the old plug. Inspect the threads in the housing for damage.
Apply a thin film of oil to the new O‑ring. Screw the new 273100577 breather into the port by hand until snug, then tighten 1/4 to 1/2 turn with a wrench – do not overtighten, as this may strip brass threads.
After installation, run the grader and check for any oil mist escaping from the breather (a small amount is normal). If oil is pumped out, the housing may be overfilled or the breather may be clogged.
Visible oil leakage from shaft seals or gaskets, oily residue around the breather itself, whistling sound when opening the fill cap, and collapsed rubber hoses on hydraulic tanks are common symptoms.
If you see oil being forced out of the breather vent, the filter is likely blocked and pressure is building. Immediate replacement with genuine 273100577 is required to avoid seal failure.
XCMG recommends inspecting breather plugs every 500 operating hours. Remove the plug and check for sludge or debris blocking the filter. Replace if the filter is clogged or if the O‑ring is hardened.
In dusty or muddy conditions, inspect every 250 hours. The 273100577 breather should be replaced as part of a major transmission overhaul (every 5,000 hours) regardless of condition.
Never operate with a blocked breather – even temporarily. The cost of a genuine breather is minimal compared to replacing multiple shaft seals or a failed hydraulic pump due to aeration.
Every genuine XCMG 273100577 breather plug comes with a 12‑month warranty. Stocked in regional distribution centers: Houston (North America), Rotterdam (Europe), Dubai (Middle East), and Shanghai (Asia).
Air freight delivery 3‑7 business days worldwide. Emergency 24‑hour shipping available for urgent repairs. Bulk orders (25+ breathers) receive discounted pricing and sea freight options.
Aftermarket breathers often use plastic bodies that crack or steel mesh that corrodes and blocks. Genuine XCMG 273100577 uses brass and sintered bronze for long life in harsh environments. Do not risk seal failure – order genuine today.
Keep spare 273100577 breather plugs in your parts inventory for every transmission, axle, and hydraulic tank on your motor grader. A simple 5‑minute replacement can prevent thousands of dollars in seal, bearing, and gear damage. Protect your XCMG grader’s drivetrain with OEM ventilation quality.
Upgrade to genuine XCMG – precise cracking pressure, efficient filtration, and robust brass construction. Order the 273100577 Breather Plug now and ensure your grader’s gearboxes stay at atmospheric pressure, dry, and clean. This small component is big insurance for your equipment’s longevity.
