KEITH® WALKING FLOOR® self-unloading systems bring mobile unloading options to where tippers and dump trailers can’t: Inside buildings and tunnels, under power lines, and on uneven or unstable ground.
Safety is essential. The horizontal unloading action of the WALKING FLOOR® system is safer than dump or tipper trailers, which can overturn in windy conditions or due to load shift. WALKING FLOOR® trailers keep you grounded.
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Below is a short list of the operational procedures and helpful hints to ensure your KEITH® WALKING FLOOR® system provides years of good service.
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- 1) The hydraulic pump and PTO system must be capable of producing a minimum flow rate of 5 gal/min at 3000 PSI [19 liters/min at 207 bar] for proper operation.
- 2) KEITH recommends a pump and PTO capable of producing between 40-60 gal/min at less than 3000 PSI [151-227 liters/min at less than 207 bar] for optimal operation.
3) Pumps with built-in pressure relief valves are NOT recommended.
4) The pump/PTO system requires a high quality pressure relief valve with the ability to relieve full pump flow at 3000 PSI [207 bar].
5) The relief valve must be set above 2800 PSI [193 bar] and no higher than 3000 PSI [207 bar].
6) Dump PTO systems will not properly operate WALKING FLOOR® unloader systems and could cause serious damage to the system.
7) KEITH recommends using a suction hose that has a spiral wire to keep the hose from collapsing under suction.
8) KEITH recommends a minimum of a 40 gallon [151 liter] reservoir to ensure oil does not overheat during operation and result in heat damage.
9) Properly installed, smaller reservoirs with coolers, may be used provided that they supply adequate cooling.
10) Heat damage will void the warranty on hydraulic components.
11) A “Ball Valve” controls the operation (Run/Stop) of the floor. A partially opened or partially closed ball valve will create heat damage and result in slower load/unload speeds or complete floor stoppage. Always open or close the ball valve completely!
12) A “Control Valve” controls the direction of the floor operation (Load/Unload)
13) Your entire wet kit system needs to meet the requirements in the Specifications section in your manual. (Additional Wet Kit information is available on our website.)
14) Pressure line and return line quick disconnects must be of the correct size & style and be free from damage. They also need to be connected appropriately (Pressure to Pressure, Return to Return) and securely attached between the wet kit and floor. (See the Specifications section of your owner’s manual for proper connection instructions.)
15) Always make sure back doors are open before engaging the WALKING FLOOR® system.
16) Never walk on or stand in the way of the material while unloading.
17) Unloading speed is a function of oil flow rate. With an oil flow rate of 40 gal/min, the approximate unloading time is 4 minutes for a 45 ft/13.5 m trailer with 3.0 inch cylinders. (Material type and other environmental variables also affect floor speed.)
* If the information about your pump and pressure relief valve is not known, have a pressure/flow check done by a professional.
Oil Flow Diagram (Video)
- Wet Kit: Does your entire wet kit system meet the requirements in the Specifications section in your manual? (Additional Wet Kit information is available on our website.)
- Plumbing: Is your entire system plumbed per the Floor to Wet Kit Connection Diagram in Specifications section in your manual?
- Connections: Inspect the quick connects on the hydraulic lines for damage or contamination. Are the pressure line and return line quick disconnects the correct size and style and are they securely attached between the wet kit and floor and are they connected Pressure to Pressure, Return to Return??
- Pump: Will it pump a minimum of 5 gal/min [19 liters/min] at 3000 PSI [207 bar]? *
- Relief Valve: Is it set between 2800-3000 PSI [193-207 bar]?
- Oil: Is the oil reservoir full?
- Power Take Off: Is the PTO engaged?
- Ball Valve: Is the ball valve, that engages the drive unit (Run/Stop), pulled fully closed?
- Control Valve: Is the control valve fully engaged in the appropriate position (Load/Unload)?
- * If the information about your pump and pressure relief valve is not known, have a pressure/flow check done by a professional.