Ice resurfacer hydraulic and control system

Explained simply

The hydraulics work like the ice resurfacer's muscles. The pump puts oil under pressure. Valves and lines direct this force exactly where it is needed. Cylinders and hydraulic motors carry out the commands from the cab in a controlled way: lower the conditioner, turn the augers, tip the tank. Build pressure, control movements, work precisely.

The components at a glance

The numbers correspond to the diagram. It shows a typical arrangement; position and design of the components depend on the model.

1. Hydraulic pump: generates the pressure for the working movements and is driven by the engine or its own electric motor. According to Wikipedia, the vehicle drive feeds both driving and the hydraulics.
2. Hydraulic oil tank: stores the operating oil for the circuit. WM technics specifies a 50-litre oil tank for the Mammoth; other models have different volumes.
3. Valve block / control block: distributes the pressure to the individual functions. On modern machines, electrically switched valves are combined in one block.
4. Hydraulic lines: hoses and pipes carry the oil safely to cylinders and hydraulic motors. They must withstand pressure, cold and movement over the long term.
5. Hydraulic cylinders: move, for example, the conditioner, attachments or the snow tank's emptying function. The augers are also hydraulically driven; on Zamboni machines, according to the manual, the horizontal and vertical augers are connected in series.
6. Control levers and control panel: this is where the driver controls the working functions. Besides classic levers, newer machines use displays and a programmable logic controller (PLC), as WM technics states for the Mammoth.
7. Sensors / safety functions: monitor operating states and support precise work, for example fluid levels, temperatures or the position of the conditioner and tank.

Hydraulics and electronics working together

Older ice resurfacers were mainly mechanical-hydraulic: the driver moved levers that switched valves directly. Today the hydraulics are usually combined with electrical and electronic components. A switch in the cab operates a solenoid valve, while a controller monitors sensor values and can prevent operating errors. The Zamboni manual describes, for example, that the vertical auger can also be reversed via a valve and the horizontal auger turns with it because both are hydraulically connected in series.

Brakes can also be hydraulic. For the Mammoth, WM technics specifies a service brake with hydraulic brake booster and a hydraulic parking brake. Such details vary greatly between manufacturers.

Why it matters

The hydraulic system allows precise, repeatable movements of the working units. The conditioner must lie on the ice with even pressure so that the blade cuts evenly; the augers must reliably convey the snow; the tank must tip safely. Well-tuned controls take the load off the driver, who has to steer, meter water and watch the boards at the same time. A hydraulic leak also risks oil on the ice – something that must be avoided at all costs.

Maintenance and practice

• Oil level and leaks: before every run, check the level and look for oil traces, especially on hoses and fittings.
• Filters: change hydraulic oil filters as scheduled. WM technics supplies the Mammoth with a wrench for water and hydraulic oil filters.
• Hoses: look out for cracks, chafing and kinks; replace damaged lines immediately.
• Function test: raise and lower the conditioner, run the augers briefly, check the tank tipping function – ideally before the first run of the day.
• Safety: never work under a raised snow tank without securing it against lowering as described in the manual.

Operating from the cab

For the driver, the controls are the most important tool. They steer with one hand and operate levers or switches for conditioner, augers and water with the other. Well-arranged controls and a clear display reduce errors, especially under time pressure in an intermission. Many rinks therefore train new drivers outside game times first before they resurface during competitions.

Read more

This completes the tour of the five assemblies; the overview shows how everything works together.

• Ice preparation & ice resurfacer: the overview
• Ice technician: who drives the machine
• Ice temperature: why degrees matter
• Zamboni history: how it all began