Feed trucks spend their day between a mill, a compound and a farm gate, and they come back carrying more than road dirt. Dust from the loading spout, residues in the hopper seams, caked mud on the chassis and a film of old feed in the corners of a tank trailer all become part of the daily cleaning load. Facilities that plan feed-truck cleaning usually argue about whether the bay is too slow long before they can say by how much. The reason is that nobody measured the work: the crew knows the job takes "most of the afternoon", and that is the end of the discussion.
Estimating cleaning time is possible without any specialist equipment. What it needs is a breakdown of the task into steps, a few timed observations at the bay, and an honest record of what the crew actually does between trucks. The numbers below are method, not promises: every site gets its own result, and the point is to get a defensible one.
Start with the truck, not the machine
Write down what one cleaning cycle has to cover on your vehicles. A tractor-and-trailer feed combination is not one surface but four or five very different ones, and each takes a different kind of effort:
- Cargo contact surfaces: hopper, tank interior, discharge door, seals and hinges. Dried feed and fines stick in seams and are the slowest part of the job.
- Chassis and running gear: frame rails, axle housings, wheel hubs, mudguards. Road film plus grease, mostly a heat-and-pressure problem.
- Cab exterior and cab interior: door sills, footwells, steering area. Short, but crews routinely skip it.
- Engine compartment and fuel area: oil and diesel film holding abrasive dust.
- Wash-off and handover: draining, wiping sealing surfaces, the inspection or record step before the truck goes back on the road.
Count the work per surface, not per vehicle. A "30 minutes per truck" figure hides the fact that a tank interior on one design may take longer than everything else combined, and it is that step, not the average, that sets how many trucks a shift can clear.
Break the cycle into timed steps
Use the same sequence every time so the numbers are comparable. A practical order for a feed truck:
- Dry removal: sweep or blow loose feed, straw and packaging debris from the cargo area, chassis and wheels before any water is applied. Skipping this is the most common cause of a slow wash.
- Pre-rinse from the top down, so run-off carries dirt off the vehicle instead of dragging it across surfaces already cleaned.
- Heat and pressure on cargo contact seams, chassis rails, hubs and the engine area.
- Contact work on painted and stainless surfaces with a brush or mitt, in sections.
- Final rinse, drain, and the record or inspection walk-around while the vehicle is still wet.
Time each of those five steps on three or four representative trucks, with the normal crew and the normal shift pressure. Do not time one perfect morning. If the bay is shared with unloading, note the waiting time separately, because waiting is not cleaning and it is usually the real bottleneck.
Add the hidden minutes that break schedules
Timed hands-on work is only part of the cycle. Add the fixed overhead that sits around it:
- Machine start-up: bringing a cold steam generator to working condition, or connecting a unit to the water supply.
- Travel between the wash position and the truck, especially in a yard where the machine must move to the vehicle.
- Consumables and utility pauses: refilling the tank, swapping a battery on a mobile unit, waiting for a hot-water unit to recover.
- Re-clean time for areas that failed the pass condition on the first pass.
- Handover: drying sealing surfaces, completing the record sheet, and moving the truck out of the position.
A useful output is two figures per vehicle type: hands-on minutes and door-to-door minutes. The first tells you what the equipment is doing for you; the second tells you how many trucks the bay can take per shift. Purchasing decisions usually turn on the second number.
Match the equipment to the position and the power supply
With the step times in hand, the equipment question gets specific. Look at where the cleaning happens, whether that position has mains power, and whether the machine has to travel to the truck.
For a fixed wash position, PowerDe lists the fixed steam cleaning machine PowerDe HW02, a 220 V unit with dry and wet steam modes plus a vacuum function. The published parameters include 6 kW heating power, a steam temperature of 160°, vapour pressure of 0.8 MPa, an 80 L SUS304 tank and a tap-water inlet, so it runs from the site water supply rather than a tanker. The product page covers vehicle exterior cleaning at fuelling and parking sites, interior vacuuming and disinfection, and engine-compartment cleaning, and it lists leakage, short-circuit, high-temperature, high-voltage, water-shortage and high-voltage-explosion protection. Those are the functions a chassis-and-engine clean needs; the page does not describe tank-interior cleaning, so confirm that use with the manufacturer before you size the bay around it.
Where the position has no mains power, or the yard layout means the machine follows the vehicles, PowerDe lists mobile units in the same cleaning equipment series. The driving-style machines PWD01, PWD02 and HMW2 combine dry steam, wet steam and hot-water modes and are described for indoor garages and narrow outdoor parking spaces, which matches many tight depot corners and farm entrances. Battery-equipped and battery-free variants are listed separately, so specify the one that matches the site. For a yard that washes several trailers a day, feed truck cleaning equipment sized for the throughput is worth specifying rather than buying a single unit and testing it later.
Judge heat and pressure by minutes saved, not by look
Steam changes the time calculation on greasy and bonded residue because the effort shifts from scrubbing to lifting. Hot steam at pressure softens hardened grease and breaks its bond to the metal, so a surface that needed a brush and several passes comes clean in fewer. Because the water is carried as vapour rather than a hose volume, the vehicle drains and dries faster, which cuts the handover step and frees the wash position sooner for the next truck.
Run the comparison on your own worst vehicle, and measure it as time, not as photographs. For one truck: record hands-on minutes per step with the current method, then repeat with heat and pressure on the greasy and bonded areas. Compare the totals for the same step. Also note how wet the vehicle is left afterwards and whether the crew still needs a brush on the same areas. If the step time does not fall on your worst truck, it will not fall on the fleet.
Set the pass condition before you argue about time
Time estimates are only stable when the standard is fixed. Define it in words the crew can use at the bay, for example: no visible feed in hopper seams, discharge door and seals; no mud on chassis rails, hubs and wheel arches; no oily film on the engine area; cab footwells and door sills clear; record sheet completed. Anything failing gets re-cleaned in the same shift, and re-cleans are counted separately so they stay visible.
Record the same fields for every truck: date, vehicle, sections cleaned, operator, hands-on minutes and any defect found during cleaning. A cracked air line, a weeping seal or a damaged hopper gasket is far easier to see on a clean vehicle, and catching it before the next load is a real saving that offsets cleaning labour.
Plan the bay utilities while you measure
The time estimate is also a utility estimate. A fixed unit needs a prepared position with mains power and a tap-water connection with the right fitting, plus standing room for operator and machine. A wash position that receives oily run-off needs an oil-water separator or a bunded pad, and interceptor rules differ by site and country, so confirm the local requirement before the bay is built. Low-water steam equipment reduces run-off volume and makes that drainage question easier to answer, but it does not remove the obligation to keep oily water out of surface drains.
For bulk feed and food-contact trailers the cleaning record has a second purpose: it shows that cargo contact surfaces and their sealing surfaces were cleaned between loads, which is what customers and inspectors ask for. In that case the wash window is fixed by the load plan, so the door-to-door figure decides whether one bay is enough or the site needs a second position.
What to give the supplier when you request a quotation
Send the facts that size the machine: tractors and trailers cleaned per day, the length of the cleaning window between return and next departure, whether the position has 220 V power, whether cleaning is indoors or outside, and which surfaces on your trailer design take the longest. If the standard layout does not fit, PowerDe lists customisation and engineering services alongside its equipment, so customized steam cleaning equipment can be specified for a depot with unusual space or throughput limits.
A facility that can state hands-on minutes, door-to-door minutes and a written pass condition is estimating cleaning time on evidence. Those three numbers also settle the next two questions — how many trucks the bay can take per shift, and whether the equipment in front of you is the right size.
