Introduction: A 4.5m three-stage mast electric stacker affects ceiling clearance, aisle entry, and high-lift load limits, so the rack plan and travel route should be settled before the purchase order.
Warehouse engineers adding 4.5m pallet positions often start with rack height and work back to the truck. A machine that lifts to 4500mm travels at a 2030mm static height, reaches a 4920mm mast top at full lift, and carries outriggers 1900mm apart at floor level. Rack beams, door frames, sprinkler lines, and aisle mouths must all agree with those figures before the layout is approved. Ordering the truck first and checking clearances later can leave high racking that the stacker cannot service properly.
A three-stage mast makes a 4.5m lift workable on a compact chassis. Three nested sections overlap as they extend, allowing the fork carriage to travel higher than any single section could reach. The assembly collapses into a short stack for travel. On the CDD-20 4.5m variant, the mast sits at a 2030mm static height when lowered and reaches a 4500mm maximum lift height at the forks. The lifted mast height is 4920mm. That is the top of the steel structure and the figure the ceiling must accommodate. Shorter CDD-20 masts weigh 620–700 kg, while the 4.5m version weighs 920 kg because of the taller mast sections and anti-rollover legs. Keep that weight in mind when planning floor loading, ramp access, and how the truck enters the building. The rated load remains 2000 kg at a 570mm load centre, but the high-lift machine around that rating is larger and heavier.
The machine travels at a 2030mm static height, so the driving route matters as much as the rack face. Door headers, sprinkler mains, lighting runs, mezzanine edges, and dock door frames all fall within that vertical band, and the truck must pass under each with the mast down. Measure the full route at its tightest point rather than relying on a single doorway. Floor unevenness and worn tyres can reduce the available gap. Travel with the load lowered and raise the mast only to place or pick a pallet.
At full lift, the mast top reaches 4920mm before anything is added on the forks. A load standing 1200mm high on the forks at 4500mm puts its top around 5700mm, and that level must clear ceiling steel, sprinkler heads with their deflector clearance, and light fixtures above the top beam. HSE guidance on lift truck operation makes the same point about overhead clearance: the raised mast and the load are both part of the route, not just the racking. If the top beam sits at 4.5m, the space above it still belongs to the truck during the lift. Sprinkler positions are often the hardest item to move later.
The 4.5m configuration is the widest in the CDD-20 range, and the outriggers are the reason. Anti-rollover legs sit outside the fork carriage and spread to 1900mm, while the machine body grows from 825mm on the shorter masts to 990mm here. The legs stay at that spread while the truck travels and lifts, so floor-level space is a travel requirement, not just a lifting detail. Measuring only the pallet and rack opening misses the part of the machine that passes either side of the pallet on the way in. That changes how aisle entry is planned. Dock doors, floor rails, pallet stops, guide rails, and the first pair of rack uprights all sit where the legs run. Because the legs pass either side of the load, a pallet that is not square on the forks matters at the aisle mouth. The minimum aisle width is 2300mm, with a 1400mm turning radius and a body length of 1850mm with the platform folded. Mark the tightest floor-level pinch point on the route, then confirm the rack aisle mouth accepts the full spread before the layout is fixed. Charging bay entrances, fire doors between warehouse zones, ramp edges, floor drains, and damaged floor slabs all sit in the travel path, and the outriggers pass over them at low level. Floor condition also matters: the machine runs on polyurethane wheels with 30mm of ground clearance, so a flat, hard indoor surface is the working assumption.
The rating is 2000 kg at a 570mm load centre, and load centre is often overlooked. It is measured from the fork face to the centre of gravity of the load. A pallet of evenly stacked cartons usually sits comfortably inside 570mm; the same pallet rebuilt with heavy items at the front and light ones behind pushes the centre of gravity further out and reduces the capacity available. At 4.5m the truck is working near the top of its lift range, so capacity is worth checking for the actual configuration rather than read straight off the rating plate. Fork position is the other half of the picture. The forks lower to 85mm, run 1150mm long, and sit 685mm apart outside-to-outside, so a pallet should sit square, centred left to right, and pushed back towards the carriage. A load hanging over the fork tips shifts weight forward at exactly the point where the mast has the least room to tolerate it. In day-to-day practice, build loads heavier at the bottom, check that pallet bottom boards are sound, and set the pallet down rather than pushing on when the mast starts to lean. No full-height load chart is published for the 4.5m configuration, so confirm the derated capacity for a specific lift height and load centre with the manufacturer, then assess those limits for the actual route before the rack layout is signed off.
The 4.5m three-stage configuration works in high racking when the route is checked before the capacity rating is relied on. Three figures do most of the work: 4920mm of lifted mast height for the ceiling, 2030mm of static height for every door and header the truck passes under, and 1900mm of outrigger spread for floor-level entry and aisle mouths. Capacity is a separate conversation, because the 2000 kg figure applies at a 570mm load centre and the derated capacity at full lift is worth checking in writing for the pallets you actually run. If you are laying out 4.5m pallet positions now, send the rack drawing, clear height to the sprinkler line, floor-level entry width, pallet weight and load centre, and target lift height. LINOTR is among the electric stacker manufacturers that can reply with the 4.5m configuration data, mast and outrigger figures, and commercial details such as lead time, packaging, and shipping for your destination. Reach our team on WhatsApp at +86 18392992688 or by email at Alice@loaderforklift. com, and we will match the mast, minimum aisle width, and indoor handling equipment specification to your building.
A：Plan around 4920mm for the raised mast top, because that is the highest point of the structure at full lift, while the forks themselves reach 4500mm. Add the height of the load sitting on the forks, then leave working clearance below ceiling steel, sprinkler heads, and light fixtures. For travel, the same truck rolls at a 2030mm static height, so door and header clearance along the route must be checked separately from the rack opening.
A：The anti-rollover legs on this configuration spread to 1900mm, and they stay at that spread while the truck travels as well as while it lifts. The machine body measures 990mm, up from 825mm on the shorter mast versions, so the legs are the widest part and the number that matters. Check floor-level openings such as dock doors, aisle mouths, guide rails, and ramp edges against that spread before confirming the rack layout.
A：The 2000 kg rating applies at a 570mm load centre, which is the normal way capacity is stated for this class of truck. Capacity at full lift depends on the actual lift height, the load centre of your pallets, and how the load sits on the forks. No full-height load chart is published for the 4.5m configuration, so confirm the derated capacity for your pallet weight and lift height with the manufacturer before finalising the layout.
