The Professional Wheel Loader Manufacturer and Distributor in China

Driveshaft vibration is a common problem that can damage transmissions and axles. Common causes include:

Worn universal joints (U-joints) – Grease them weekly. If there is play when you twist the shaft by hand, replace the U-joints.

Mud or debris build-up – Clean the shaft thoroughly. Even small amounts of mud can throw off balance.

Bent shaft tube – A visible bend or runout over 2mm requires shaft replacement.

Center bearing wear – On two-piece shafts, a worn center bearing allows excessive movement.

If cleaning and greasing do not fix the vibration, have the shaft professionally balanced or replace it.

Bucket teeth wear gradually, and replacing them at the right time saves money. Replace teeth when:

The tooth tip is blunt – Less than 25mm of the original length remains, reducing penetration.

Wear reaches the adapter nose – If the tooth has worn down to where the adapter itself is exposed, the adapter will wear quickly and become expensive to replace.

Asymmetrical wear – One side of the tooth is significantly more worn than the other, causing the bucket to track sideways when digging.

Replace teeth in sets, not individually. Mixing new and worn teeth places uneven stress on the adapters. Keep spare teeth on site for quick replacement.

A soft or sinking brake pedal indicates a loss of hydraulic pressure in the brake system. Start with these checks:

Brake fluid level – Low fluid in the master cylinder reservoir means a leak somewhere. Inspect all brake lines, calipers, and wheel cylinders for wet spots.

Air in the system – Spongy pedal feel often means air is trapped. Bleed the brakes at each wheel, starting from the farthest from the master cylinder.

Brake booster or accumulator – If the machine has a hydraulic brake booster, low nitrogen pre-charge or pump pressure will cause a soft pedal. Check accumulator pressure with a gauge.

Master cylinder seals – If fluid is full and no external leaks exist, the master cylinder may be bypassing internally. Rebuild or replace it.

Do not operate the truck with a soft pedal — it will only get worse and can lead to complete brake failure.

A soft or sinking brake pedal indicates a loss of hydraulic pressure in the brake system. Start with these checks:

Brake fluid level – Low fluid in the master cylinder reservoir means a leak somewhere. Inspect all brake lines, calipers, and wheel cylinders for wet spots.

Air in the system – Spongy pedal feel often means air is trapped. Bleed the brakes at each wheel, starting from the farthest from the master cylinder.

Brake booster or accumulator – If the machine has a hydraulic brake booster, low nitrogen pre-charge or pump pressure will cause a soft pedal. Check accumulator pressure with a gauge.

Master cylinder seals – If fluid is full and no external leaks exist, the master cylinder may be bypassing internally. Rebuild or replace it.

Do not operate the truck with a soft pedal — it will only get worse and can lead to complete brake failure.

A parasitic draw (battery drain with the key off) is frustrating but usually traceable. Follow this sequence: First, disconnect the battery negative cable and connect a multimeter in series (amps mode). A draw above 0.05 amps (50 milliamps) indicates a problem. Second, pull fuses one by one and watch the meter. When the draw drops, you have identified the circuit. Common culprits include a stuck ignition relay, faulty alternator diode (allows current to flow backward), aftermarket accessories (lights, radios, GPS) wired directly to the battery, or a worn starter solenoid. Third, inspect battery terminals and ground cables for corrosion; a poor ground can also cause a continuous draw. If the alternator is the cause, replace the diode pack — do not simply recharge and ignore it. For modern forklifts with electronic controllers, have a dealer scan for modules that fail to enter sleep mode.