Hydraulic wet kits let your lorry run both tipping trailers and walking floor systems from one installation. You gain twin functions without extra hydraulic systems, cutting costs and weight while adding options for various haulage jobs.
The tri-line system provides ideal pressure and flow rates for both tasks. Your hydraulic setup handles the high-pressure tipping needs alongside the steady flow demands of walking floor systems, which can be managed from your cab with easy switches.
Core components and capabilities
Each kit has a big aluminium oil tank with mounting choices suited to your truck model. You also get a high-displacement bent-axis piston pump that gives 108 litres per 1000 RPM at pressures up to 350 BAR, strong enough for heavy loads.
The system has a manual three-way diverter valve for selecting between jobs. Your kit includes a directional tipping valve with air controls and a complete PTO system with blocks, shafts and gaskets for your gearbox type.
Cab controls work without you leaving your seat. Safety parts include pressure relief valves, internal filters and breathers to keep systems running for thousands of hours, lowering upkeep costs and guarding your investment.
Model examples for major truck brands
Scania
The Scania P, R, G, and S Series kit features a premium 190-litre rear-cabin-mounted tank made of lightweight aluminium.
Heavy-duty mounting brackets secure the tank firmly without chassis drilling, preserving your warranty conditions and resale value. The bent-axis pump delivers massive torque even at low engine RPM, perfect for busy construction sites.
Your hydraulic system works with nine gearbox variants, including industry-standard GRS/GR 875-925, in both manual and Opticruise configurations.
Stainless steel fittings prevent corrosion damage, while the premium 25-micron filter removes metal particles and extends oil life beyond 2,000 operating hours. The tank dimensions (110cm × 65cm × 32cm) allow easy maintenance access.
Renault
Renault DXI and T Range kits benefit from a compact yet powerful 200-litre side-mounted tank system with built-in baffle plates to prevent oil surges.
The kit’s diverter valve offers progressive flow control rather than simple on-off operation, protecting trailer mechanisms and hydraulic seals from pressure spikes.
You get compatibility with five I-Shift gearbox types, including AT2412C/D and AT2612D/E models, covering vehicles manufactured from 2014 onwards.
The pneumatic PTO engagement system features dual safety interlocks preventing accidental operation, while the tipping valve includes emergency manual override functions for roadside recovery situations.
Volvo
Volvo FM and FH kits include a 200-litre side tank measuring 38cm × 75cm × 75cm for maximum oil cooling capacity.
The tank design incorporates return line diffusers that reduce oil foaming and extend pump life by preventing cavitation damage during heavy cycling operations.
Your kit works flawlessly with the complete AT2412-AT2612 I-Shift gearbox range across Euro 4, 5, and 6 engines, making it suitable for fleets with mixed-age vehicles.
The bi-directional bent axis pump runs at cooler temperatures than gear pumps, reducing wear while delivering consistent performance in extreme climates.
All kits include essential connection hardware: two rotary swivel couplings, ball valves, reducing adapters, and T-pieces matching industry-standard BSP thread patterns.
Additional reading: How much do hydraulic wet kits cost in 2025?
