XCMG QY25K Middle Drive Axle 134902511 / 18TMRF-C223BFC
Part number 134902511 and assembly reference 18TMRF-C223BFC are listed for a middle drive axle used on selected XCMG QY25K truck crane chassis. Axle position, gear ratio, brake configuration and chassis data must be verified before supply.
Identification Checklist
Part number 134902511 and axle reference 18TMRF-C223BFC
XCMG QY25K chassis serial number
Axle nameplate and ratio information
Input flange, differential housing and mounting layout
Wheel-end, hub and brake configuration
Inter-axle differential or lock controls where fitted
ABS or other sensor connections where applicable
Application and Service Scenarios
The complete middle axle may be required after confirmed housing damage, differential or gear-set failure, severe bearing damage, brake or wheel-end destruction, or a chassis overhaul where the existing assembly cannot be economically repaired. It can also support fleet maintenance when a verified spare axle is prepared to reduce downtime. Oil leakage or driving noise alone should be diagnosed before replacing the complete axle.
Why Ratio and Axle Position Matter
Driven axles operating in the same vehicle must use compatible ratios. An assembly that mounts correctly but has a different ratio can cause driveline wind-up and damage. The middle axle should not be confused with a rear or front axle, and 18TMRF-C223BFC should be compared directly with the removed nameplate.
Inspection Before Installation
Inspect propeller shafts, suspension mounts, torque rods, brake lines, air connections and wheel-end components. Check lubricant condition and identify the cause of the original failure. Use approved lifting equipment for the heavy assembly and follow the axle service information for lubricant, brake connection and driveline alignment.
Export Preparation
Openings are capped, flanges and wheel-end surfaces are protected, and the axle is supported on a reinforced skid at stable load points. The package label shows middle-axle position, 134902511 and 18TMRF-C223BFC.
Frequently Asked Questions
Is 134902511 enough to confirm the axle?
It is the primary part reference, but axle tag, ratio, brake configuration and chassis serial number should also be compared.
Can a rear axle be used in the middle position?
Not unless the complete position-specific design and ratio are technically confirmed.
Does axle noise always require a complete replacement?
No. Bearings, gears, lubricant, propeller shafts and wheel ends should be diagnosed to determine the repair scope.
