Dump Truck Maintenance Checklist
for Mining & Quarry Sites

A 6x4 tipper in a quarry works in the worst conditions a truck can face: abrasive dust, impact loading, steep ramps and continuous short cycles. Most premature failures are not mysterious — they are the result of a handful of checks that were skipped. This checklist is built around a Euro II mechanical truck such as the HOWO-7 371HP, and it scales to any 6x4 tipper.

Daily checks — start of every shift

• Engine oil and coolant levels — check before the first start; top up, and investigate any drop that repeats.
• Walk-around for leaks — look under the engine, gearbox and rear axles for fresh oil. A Euro II truck should not drip.
• Tire pressure and visible damage — 12R22.5 tires take a beating on sharp rock; check cuts in the sidewall and between the duals.
• Wheel nuts — especially on a freshly refurbished truck's first weeks of work.
• Brakes and air pressure — build pressure, listen for leaks at the air tanks and lines, confirm the parking brake holds on a ramp.
• Lights, indicators and horn — site rules and road sections both require them.
• Dump body and tailgate — check the body locks and hinge pins before loading, not after.

Weekly checks — every 50–60 hours

• Air filter — clean or replace; on a dusty site this is the single highest-value task on the list.
• Hydraulic oil level — check with the body fully lowered, and inspect the tank and hoses for weeping.
• Grease all nipples — kingpins, spring pins, body hinge pins, the tipping cylinder eye and the tailgate linkage.
• Battery terminals and electrolyte — vibration loosens terminals constantly.
• Wiper, washer and cabin A/C — driver comfort is a productivity item, not a luxury.
• Drain the air tanks — water in the air system causes brake valve failure in cold or wet seasons.

Monthly checks — every 250 hours

• Engine oil and filter change — follow the shorter interval if the truck runs loaded in dust all day.
• Fuel filter and water separator — drain and replace; dirty fuel is the usual cause of "loss of power" complaints.
• Gearbox and axle oil levels — top up and look for leaks at the hub seals.
• Leaf spring U-bolts and hangers — retorque; shock-loaded trucks loosen them.
• Brake adjustment — drum brakes on the rear axles need regular adjustment to stay balanced.
• Dump body plate inspection — look for cracks starting at the corners and along the bottom beams; weld early, while the crack is short.

The dust problem: air intake and filters

In a quarry, the air filter is the engine's life insurance. A blocked paper element costs power and fuel; a torn one destroys an engine in a single shift. This is why the engineering-version intake — an oil-bath air filter — is specified on trucks destined for mines and construction sites: it tolerates heavy dust loading and can be serviced on site without waiting for a spare cartridge. Whatever the type, service the intake on hours worked in dusty conditions, not on kilometres travelled.

Dump body and hydraulic system

• Never drive with the body raised — it is the fastest way to bend a chassis or rip off overhead services.
• Load on level ground. Tipping on a slope twists the frame and the cylinder.
• Change hydraulic oil and the return filter on schedule; contaminated oil is the top cause of slow or jerky tipping.
• Check the tipping cylinder for scoring and oil weeping at the rod seal.
• If material sticks, do not "rock" the load with the hoist — use a shovel or a vibrator, or specify a smoother body liner at purchase.

Wear parts to keep on the shelf

Stock these before the truck arrives, because they are cheap in China and expensive-plus-slow at a remote site:

• Oil, fuel and air filter sets (at least two complete sets per truck)
• Brake pads and shoes, plus a clutch kit
• Wheel-hub oil seals and axle gaskets
• Hydraulic hoses and seals for the tipping cylinder
• Fan and alternator belts, bulbs, fuses
• Two spare tires and a repair kit