KL Seating · Excavator seats
Excavator Seat Manufacturerfor Machine Builders and Distributors: YQ40, YQ50 and YS15
KL Seating is an excavator seat manufacturer and factory direct supplier for machine builders, distributors and importers. Machine builders that fit seats on new excavators start from the cab drawing. Distributors, importers and refit shops that supply replacement seats start from the old seat taken off the machine. Both routes end in the same reply: a named model with the parameter sheet and the drawing that go with it.
Machine builders
I hold the cab drawing
- Base hole pattern
- Free height above the base
- Operator weight range
Distributors, importers, refit shops
I hold an old seat
- Machine make and model
- Photos from the front, the side and underneath
- Model plate, if there is one
- Seat manufacturer since 2007, own brand KL Seating since 2016
- 500,000 seats a year from our own production lines
- ISO 9001:2015, CE, RoHS and REACH certificates
- Customized, modular seat systems for machine builders
- Exports to Asia, the Americas and Europe
Three Excavator Models Side by Side: YQ40, YQ50 and YS15
Tick the models you want to compare. The table keeps only the ticked columns, and the button below writes the models into your email. A dash means the figure is not on the parameter sheet or the drawing; the matrix further down says which of those the factory answers.
| Figure |  YQ40 |  YQ50 |  YS15 |
|---|---|---|---|
| Overall size | 570 × 480 × 1160 mm | Read from the drawing, which carries the side and front views | 525 × 610 × 780 mm |
| Weight range | — | — | 50 to 130 kg |
| Suspension | — | Air bag suspension marked on the drawing | 40 to 110 mm of travel |
| Height adjustment | Front and rear of the cushion each tilt ±9°, which is 65 mm | 60 mm, air bag stepless adjustment | — |
| Slide | 120 mm forward, 110 mm rearward, 23 fixed positions | 120 mm fore-aft | 176 mm, in 16 mm steps |
| Backrest | 80° to 121° | 30° to 60° | 85° forward, 45° rearward, tolerance ±5° |
| Mounting holes | Hole map on the external drawing | Hole map on the external drawing | — |
| Cover | PVC | PVC | Black PVC or fabric |
| Options | Armrests, headrests, seat belts | Armrests, headrests, seat belts | Armrests, headrests, seat belts, electric lock |
YQ40: where the figures come from
- Parameter sheet: the sizes and adjustment ranges.
- Drawing: written requirements for the stitching, the welds and the locks, quoted in the frame and cushion sections.
YQ50: where the figures come from
- Drawing: the air bag suspension, the damping function, the locking mechanism and a switch that sets firmness and height to the operator's weight.
- Sheet: the same 60 mm of height adjustment.
YS15: where the figures come from
- Sheet: a published weight range and suspension travel.
- Factory reply: the suspension type and the mounting holes, which the sheet does not state.
Weight Adaptation: YS15 Weight Range and YQ50 Air Bag Height Control
Operator weight sets how a seat suspension behaves, so the first question for an excavator seat is how each model is set to the person sitting in it. The three models answer with different information.
YS15 weight adjustment on the parameter sheet, with suspension travel from 40 to 110 mm.
If your operators fall inside 50 to 130 kg and you select on suspension travel, YS15 is the model to start from. If you want weight setting from a switch and height from an air bag, the YQ50 drawing is the document to request.
YS15
The model with figures on the parameter sheet: weight adjustment 50 to 130 kg, suspension travel 40 to 110 mm. The sheet does not state the suspension type, so the type and the way the travel is set are requested from the factory and arrive with the enquiry reply. The full data is on the YS15 excavator seat manufacturer page.
YQ50
The drawing marks air bag suspension. It records that the seat height is adjustable, with over a travel of 60 mm, that the seat has a damping function, and that a switch sets the firmness and the height to the operator's weight. Neither the sheet nor the drawing publishes a weight range or a suspension travel figure.
YQ40
Publishes no weight range and no suspension data on the sheet or on the drawing. Its adjustment is covered in the sections below, and weight and suspension questions for YQ40 are answered by the factory in the enquiry reply.
Published Figures and Factory Answers by Model
This matrix collects what the sections on this page state. A filled dot means the figure is on the parameter sheet or the drawing. An empty ring means it comes from the factory with the enquiry reply.
YQ40
YQ50YS15Send the machine model and the seat position, and the reply carries the factory's answers for the model that matches your excavator, together with its drawing and parameter sheet.
Mounting Check: Hole Maps, Overall Size and 3D Scan Fit Check
The hole maps sit in the drawings, and the drawings differ by model. The drawing file travels with the enquiry reply, and this page does not copy its dimensions.
Hole maps
YQ40 and YQ50 each have an external drawing with a mounting hole map, which the engineer lays over the cab floor. YS15 has no hole data on the parameter sheet, so its hole pattern is requested from the factory and goes out with the drawing.
Overall size
On the parameter sheet for two models: YQ40 measures 570 × 480 × 1160 mm and YS15 measures 525 × 610 × 780 mm. For YQ50 the envelope is read from the drawing, which carries the side and front views.
At the factory
checks the base hole positions and the frame outer dimensions, and the result goes back to the buyer against the model parameter sheet.
Enquiry Checklist: Copy the Set That Matches What You Hold
Copy the set that matches what you hold into an email. Both sets lead to the same reply.
If you hold the cab drawing
Machine builders, engineering and purchasing.
- Machine make and model, and the seat position in the cab.
- Base hole pattern and the free height above the base.
- Front-to-back space available for the slide.
- Operator weight range the seat is set for.
- Options you need, taken from the option list for each model.
- Whether the request is for a standard model, a custom change or a seat built to your drawing.
If you hold an old seat
Distributors, importers and refit shops.
- Machine make and model.
- Photos of the old seat from the front, the side and underneath, with the model plate if there is one.
- Overall dimensions of the old seat and the distance between its mounting holes, if you can measure them.
- The models and options you want to hold, and whether the seats carry your own brand.
The seat fitment compatibility guide for machine builders and distributors lists what to measure on the machine before the first message.
Adjustment and Locking: YQ40 Slide, Backrest and Height Tilt
Operators of different height sit in the same cab, so the slide, the backrest and the height settings are the part of the seat used every shift. YQ40 carries the fullest set of figures among the three models.
Fore-aft slide, in millimetres
YQ40
YQ50
YS15YQ40 slide
120 mm forward and 110 mm rearward.
Backrest
YQ40 backrest adjusts from 80° to 121°.
Height tilt
The front and the rear of the cushion each tilt in height.
YS15 steps
176 mm of fore-aft adjustment.
What the three YQ40 settings cover
These three YQ40 settings let one seat cover operators of different height and cabs with different free space, and the figures are the ones to check against the cab layout before a seat goes on a machine.
Drawing requirements and unpublished items
The YQ40 drawing requires the headrest, the backrest, the armrest, the front and rear height, the slide-rail adjustment and the damping lock to be flexible and reliable. The drawing states the requirement in words and publishes no test figure for it. The drawing file is the document to request if you want to read the requirement in full.
The sheet and the drawings do not publish the slide rail construction, the lock force or an operating-cycle count. Those three items are requested from the factory and come back with the enquiry reply.
How YQ50 and YS15 compare
YQ50 and YS15 publish their adjustment on a different basis. YQ50 gives 120 mm of fore-aft adjustment and a backrest from 30° to 60°, and its drawing records a locking mechanism. YS15 gives 176 mm of fore-aft adjustment in 16 mm steps and a backrest of 85° forward and 45° rearward, within a tolerance of ±5°. So the three seats set the slide in different ways: 23 positions on YQ40, 16 mm steps on YS15 and a stated travel on YQ50. Send the operator seating range and the free space in the cab, and the reply names the model whose travel covers it. The YQ40 heavy machinery seat supplier page carries the full YQ40 data.
Frame and Welding: CAE Check, Robotic Welding and YQ40 Drawing Requirements
The frame is the part of the seat the operator never sees and the part every adjustment above it relies on. At KL Seating the frame follows one production route on our own automated lines in the 35,000 m² plant.
- Step 1 · Design stage
CAE structural analysis
The frame is analyzed by at the design stage.
- Step 2
Precision stamping
The frame parts are made by precision stamping.
- Step 3
Robotic welding
The parts are welded at the robotic welding station.
- Step 4
Assembly
The seat is assembled with the suspension, the slide and the options the buyer selected.
Welded assemblies show no misalignment, no cold welds and no missing welds, and the frame and the exposed parts are treated against rust.
That is what the YQ40 drawing requires. These are drawing requirements, and the drawing is the document where the buyer's engineer reads them.
How a finished weld is accepted and which rust protection process is used are not published in the drawing. Both are requested from the factory and come with the enquiry reply. The requirement quoted above belongs to the YQ40 drawing; the YQ50 and YS15 drawings are not quoted here for the frame. If your excavator seat goes through a supplier approval, the frame is where the engineer and the quality department start.
Cushion, Cover and Options: Three Excavator Models Compared
- Cushion: molded on our own foam molding line and checked by a pressure distribution comfort test, which evaluates how the cushion spreads pressure over long sitting. The page carries no test figure.
- YQ40 dimensions: cushion height 270 to 335 mm, cushion width 485 mm, cushion depth 470 mm, backrest 630 mm high and 480 mm wide.
- YQ40 seams: the drawing requires seams stitched with thread of not less than 30 N and a needle pitch of 3 to 5 mm.
YQ40
YQ50YS15Enquiry Reply Documents and the Buyer-Side Readers
An enquiry reply carries a set of documents, each with its reader on the buyer's side.
Parameter sheets for YQ40, YQ50 and YS15
The sheet is the reference for model data, and purchasing orders against it. Where a figure on a drawing differs from the sheet, the sheet governs.
External drawings for the same three models
The drawing is for the structural engineer, who lays it over the cab layout and checks the hole map and the space.
ISO 9001:2015, CE, RoHS and REACH certificates
Copies are filed with the supplier record. The certificate numbers are on the copies and not on this page.
Supply Routes: OEM, ODM, Wholesale and Private Label
OEM and ODM
Machine builders are supplied as OEM and ODM customers with customized, modular seat systems. The model is fixed from the cab drawing and the hole pattern, and structural changes go through our R&D center.
OEM and ODM seat manufacturer programsWholesale and private label
The full line can be matched to the machines they serve and carry their own brand, and bulk supply can be arranged by series with the models and options written on one sheet. The other construction machinery models are on the construction machinery seat manufacturer range.
Construction machinery seats for machine builders and distributors
The Factory Behind the Seats: MES, Testing Center and Factory Visits
The MES covers research and development, purchasing, production, quality inspection, warehousing and delivery as one record chain.
Factory visits can be arranged by appointment.
Name the model for your excavator
One message with the machine and what you hold is enough for the model, the sheet and the drawing to come back together.
Send the Machine Make and Model
Send the machine make and model, with the cab drawing details or photos of the old seat. We reply with the matching model and the documents for it. The contact page for the excavator seat manufacturer has the same enquiry form.
Reach us directly
What to include
- Machine make and model
- Cab drawing details, or photos of the old seat
- Operator weight range, if you hold the cab drawing