Ufuk Şahin

Articles by Ufuk Şahin on the RSS Kumru Automotive blog.

Drawing: side view of a tractor unit with its cab tilted fully forward; behind it the cab’s drive position in dashed outline, above it the arc the cab travels, with top dead centre marked at the top of the arc; the tilt cylinder under the cab and the hand pump on the chassis; the magnifier shows the pump’s two-position selector valve set to tilt, with the pump lever fitted

September 22, 2026Trucks

How to tilt a truck cab: Mercedes-Benz, Volvo FH, DAF XG

How to tilt and lower a truck cab: preparation, selector valve, pumping and locking, with maker notes for Mercedes-Benz, Volvo FH and DAF XG.

Drawing: a wheel and axle seen from behind; the chassis above, with a rigid brake pipe clipped beneath it; the flexible brake hose leaving the end of the pipe sags onto the axle and runs on to the brake caliper beside the wheel; the point of contact is marked in red; the magnifier shows the surface of the hose: on the left only cracks and chafe marks, on the right the outer cover worn through and the reinforcement (cords) showing beneath it

July 28, 2026Trucks

When does a brake hose need replacing? What counts as a defect at inspection

Inspection texts set no interval for a brake hose; they judge its condition. Exposed cords, bulging or a leak fail the test. Categories and a checking order.

Drawing: a hydraulic steering circuit; the steering gear, with its column and wheel on top, the pump and the fluid reservoir are joined by three lines: the supply line from reservoir to pump, the pressure line from pump to gear and the return line from the gear back to the reservoir; a bulge on the pressure line is marked in red, with fluid dripping from it; the magnifier shows the cracked, sweating surface of the hose

July 14, 2026Trucks

What happens when a truck power steering hose bursts? Replacement and bleeding

A burst hose drains the fluid and the assist goes; the truck still steers, heavily. Warning signs, what matters at replacement, and how to bleed.

Drawing: a discharge line falling without a dip from the compressor beside the engine to the air dryer on the chassis, with an air tank behind the dryer; the compressor is marked in red; the magnifier shows the line in cross-section: a thick layer of carbon coats the inner wall and only a narrow air passage is left in the middle

May 19, 2026Trucks

Compressor discharge line: carbon, oil and slow air build-up

Carbon in the line between compressor and air dryer slows air build-up. Makers’ rules for length, bore and slope, when to replace it, what to check first.

Drawing: on a bench, the vehicle’s workshop manual and a cab tilt hand pump with its reservoir on top and the filler plug taken out; beside it two glass jars: clear oil in one, oil turned milky in the other, with water drops in it, marked in red; the magnifier looks into the reservoir through the filler opening: the oil covers the piston

May 5, 2026Trucks

Cab tilt oil: which fluid goes in, and why it turns milky

Which oil goes in a cab tilt pump, is ATF allowed, and why does it turn milky? Fluids, level check and oil change from the makers’ own documents.

Drawing: a tractor unit with its cab lowered; on the chassis a hand pump with its lever moving, a full reservoir on top and two hoses running from the pump to the cylinder; the magnifier shows air bubbles in the oil inside the hose

February 9, 2026Trucks

How to bleed a cab tilt pump

A lever that moves while the cab stays put means air or low oil. The manufacturers’ bleed sequences, the reservoir rule and the safety points.

Drawing: a tractor unit with its cab tilted forward; the tilt cylinder under the cab, the hand pump on the chassis and the two hoses between them; the magnifier shows the push and pull hoses at the cylinder

September 23, 2025Trucks

Cab tilt hoses: choosing the right one, replacing it, and which end goes where

The two hoses do different jobs and cannot be swapped. Finding a hose by OE reference, a table of lengths and threads, replacement steps and the bleed sequence.

Drawing: a tractor unit with its cab stuck part-way; the places to check are marked in order: cab lock, selector valve, oil level and, last, the hand pump; the magnifier shows the tilt cylinder in section with oil leaking past the piston

June 19, 2025Trucks

Cab won’t tilt, won’t lower or creeps down: pump, cylinder or hose?

Which part is at fault when a cab will not tilt, lower or hold? A symptom table, the pump pressure test and the rule that spares the pump.

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