The genuine XCMG 800354991 Hand Brake Controller is a pneumatic parking brake valve for motor grader cab systems and safety circuits.
This OEM 800354991 hand brake controller allows the operator to manually apply and release the spring‑applied parking brake with ergonomic lever action.
Manufactured from corrosion‑resistant aluminum casting with precision‑ground internal spools and high‑grade seals, it provides reliable pneumatic control at up to 10 bar.
Engineered for XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders, this controller integrates directly into the cab’s dashboard.
It is a direct replacement for worn, leaking, or sticking parking brake valves in the grader’s air brake system.
The hand brake controller directs compressed air to release spring brakes and exhausts air to apply them.
A faulty controller can prevent brake release (machine immobilized) or cause unintended brake drag (overheated brakes, higher fuel use).
Replacing a damaged controller with genuine XCMG 800354991 restores positive parking brake control and eliminates air leaks in the cab.
This controller is also used in emergency brake systems and trailer brake circuits on graders with towing options.
XCMG 800354991 guarantees OE fit, correct lever travel, and long‑term sealing integrity under extreme temperature swings and vibration.
| Parameter | Specification |
|---|---|
| OEM Number | 800354991 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Hand Brake Controller / Parking Brake Valve (Pneumatic) |
| Operating Pressure (Max) | 10 bar (145 psi) |
| Port Size (Supply/Delivery) | 2x M12×1.5 (tapered), 1x M10×1 |
| Lever Type | Spring‑return to applied with detent locking |
| Body Material | Corrosion‑resistant aluminum die‑cast (anodized) |
| Internal Spool Material | Stainless steel (ground finish) |
| Seals | Nitrile rubber (NBR) with low‑temperature flexibility |
| Flow Capacity (at 6 bar) | 150 L/min (supply to delivery) |
| Exhaust Flow | 200 L/min (built‑in silencer) |
| Operating Temperature Range | -40°C to +85°C (-40°F to +185°F) |
| Lever Force (Typical) | 15 N (3.4 lbf) at detent release |
| Mounting Hole Pattern | 4 holes, Ø5.5 mm, 65×45 mm rectangle |
| Protection Class | IP65 (dust‑tight, water jet protected) |
| Standards | ISO 7638, ECE R13, FMVSS 121 |
| Test Pressure (Proof) | 15 bar (218 psi) for 2 minutes |
| Lever Travel Angle | 45° (applied) to 15° (released) |
| Compatible Models | XCMG GR135–GR350 motor graders |
| Superseded Part Numbers | 800354978, 800354985, 800354988 |
The 800354991 hand brake controller is the operator’s primary interface for the spring‑applied parking brake.
When pulled, the lever exhausts air from brake chambers, allowing springs to apply brakes.
When pushed in, the valve supplies compressed air to release spring brakes, enabling machine movement.
A sticky or leaking valve can prevent release, stranding the grader, or cause brake drag.
In emergencies, the controller provides an intuitive way to stop the machine quickly.
A properly functioning hand brake valve is a legal requirement for site safety compliance.
Replacing a worn controller with genuine XCMG 800354991 restores positive brake feel and eliminates air leaks.
Each 800354991 controller body is precision die‑cast from aluminum and anodized to resist corrosion.
The internal stainless steel spool is ground to a mirror finish, reducing friction and wear.
Nitrile rubber seals stay flexible at -40°C and resist hot air aging at +85°C.
A built‑in silencer reduces exhaust noise, and a detent prevents accidental lever movement.
XCMG tests every valve for leakage at 10 bar, with allowable drop less than 5% over 60 seconds.
Each unit is cycle‑tested for 50,000 operations to validate detent and seal life.
To replace a faulty controller, drain air from the brake system and remove the cab panel.
Disconnect the three air lines (supply, delivery, exhaust). Unscrew the old controller from the dashboard.
Install the new 800354991 using the supplied gasket. Connect air lines with thread sealant and torque to 15 Nm.
Recharge the air system and test: pull lever – brake applies; push in – brake releases immediately.
Listen for leaks using soapy water. Never reuse old seals or damaged air lines.
Keep a spare 800354991 controller in your parts inventory to minimize downtime.
Air leaking from the cab area, weak or no brake application when lever is pulled, and failure to release brakes when pushed in.
Also, sticky or hard‑to‑move lever, brake drag after release, and inability to hold grader on a slope.
If the valve does not exhaust air when pulled, do not operate the grader – replace immediately with genuine 800354991.
Inspect the hand brake controller during every annual brake test or every 1,000 operating hours.
Check for external air leaks, smooth lever operation, and positive detent engagement.
Typical service life is 5,000‑6,000 hours under normal use. In wet/moist environments, install an air dryer.
Keep the controller clean; vacuum around the lever to prevent grit from entering the exhaust port.
Replace the valve if lever feel becomes gritty or notchy, or if leakage persists after tightening connections.
Genuine XCMG 800354991 hand brake controllers carry a 12‑month warranty.
Regional stocking hubs: Houston (USA), Rotterdam (Netherlands), Dubai (UAE), and Shanghai (China).
Standard air freight delivers within 3‑7 business days worldwide. Emergency 24‑48 hour shipping available.
Bulk orders (5+ controllers) receive volume discounts and sea freight options for fleets.
Aftermarket controllers often use cheaper zinc casting, soft seals, and poorly machined spools.
Genuine XCMG 800354991 ensures proper materials, leak‑free operation, and full regulatory compliance.
Don’t risk a parking brake failure – a single stuck valve can immobilize a grader on a slope.
Order the genuine XCMG 800354991 Hand Brake Controller today and maintain positive, safe parking brake control.
Upgrade your motor grader’s brake system reliability with XCMG genuine pneumatic valves – precision machined, leak‑tested, and built for the toughest environments.
