Construction Machinery Knowledge - 黑料福利网

23/May2026

Excavator Maintenance Tip: Differentiating Main Relief Failure From Pump Wear

When an excavator is weak and slow under load, the default diagnosis is often a worn-out main hydraulic pump. But tearing down a main piston pump is an expensive, multi-thousand-dollar mistake if t...

23/May2026

Loader Maintenance Case: The Articulation Harness Chafe

A wheel loader had a bizarre and dangerous electrical gremlin. It would operate perfectly fine driving straight, but the moment the operator turned the steering wheel hard to the right-like when tu...

22/May2026

Forklift Maintenance Case: The Iced-Up LPG Vaporizer

A heavy-duty LPG (propane) forklift was losing power badly after 20 minutes of heavy use in a cold warehouse. It would start fine and run perfectly, but as it heated up under load, the engine would...

22/May2026

Excavator Maintenance Tip: Testing The Swing Brake Sequence Valve

When an excavator's swing brake fails to release, the operator will notice the machine is sluggish to start swinging, and then jerks into motion. If left unfixed, the friction plates in the swing b...

22/May2026

Loader Maintenance Case: The Rusted Suction Hose Braid

A wheel loader was brought in with a maddening symptom. On cold mornings, the hydraulic pump would let out a horrific, screaming whine when the operator pushed the pedal to the floor. If the operat...

21/May2026

Forklift Maintenance Case: Wet?Plate Contamination From A Leaking Axle Seal

A heavy electric counterbalance forklift with a wet?disc brake axle was reported as "creeping on the grade with the park brake applied." The park brake would hold on flat ground, but on a slight ra...

21/May2026

Excavator Maintenance Tip: Chilled Hydraulic Oil And The Risk Of Internal Leaks

On some electric excavators, the hydraulic oil cooler is so efficient that in cold weather the oil can be chilled below the optimum range. Thick oil increases pump suction and can cause cavitation,...

21/May2026

Loader Maintenance Case: Encoder Drift On An Electric Drive Axle

A battery?electric wheel loader was derating intermittently. The operator would be driving across the lot at full speed when, without warning, the ECU would cut power to the drive motor and drop th...

20/May2026

Forklift Maintenance Case: The Inner?Delaminated Hose That Became A One?Way V...

An IC forklift would lift heavy loads very slowly and with a shudder, but lowering was smooth and normal. The shop replaced the lift cylinder piston seals, thinking internal bypass was causing the ...

20/May2026

Excavator Maintenance Tip: The Deadly Risk Of Mixing AW And HV Hydraulic Oils...

On a cold?climate excavator, you might check the hydraulic tank and see a label saying either AW 46 or HV 46. Both are 46 weight oils, but at –10°C their behavior is completely different....

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