Used Pfauter P 400 for sale (50)

Condition: excellent (used), Max. diameter: 1250mm Module: 14 Bedpoyghyksfx Aglscu

Condition: used, Year of construction: 2004, Technical details: max. wheel diameter: 130 mm gear width: 25 mm module max. : 3 module min. : 0,5 control: Siemens 840D work-spindle diameter: 85 mm strokes - infinitely variable: 500 - 2500 Hub/min stroke: 30 mm total power requirement: 48 kVA weight of the machine ca.: 11,5 t Bodpfevi Ninjx Aglscu space requirements approx. LxWxH: 4,7 x 3,0 x 3,3 m Equipment: -Counterholder with tip -chip conveyor -hydraulically operated counterholder arm and linear guides i.D. *

Condition: used, Year of construction: 2002, Technical details: max. wheel diameter: 130 mm gear width: 170 mm max. module: 3 min. module: 0,5 total power requirement: 48 kVA weight of the machine ca.: 9 t dimensions of the machine ca.: 7,64 x 3,14 x 3,25 m For technical data, see PDF-File enclosed Bcodpfx Ajwdyx Ujglju *

Condition: used, Year of construction: 2014, Infeed and outfeed chain conveyor, with tool holders, chip conveyor, hydraulic unit and air conditioning. Bjdpoxtbmiefx Aglecu *

Condition: used, Year of construction: 2001, Technical details: max. wheel diameter: 80/120 mm max. module: 2,5 max. top circle diameter: 65 mm : 22 mm : 140 mm : 120 mm slide travel axial ( Z-axis ): 320/400 mm Dimensions (L/W/H): 3270 x 3240 x 2020 mm weight of the machine ca.: 6 t Bodpfx Agoxrwpkolecu P60 - The compact all-rounder for wheels, shafts and worms The P60 is the smallest machine in the Gleason line of horizontal hobbing machines. The all-rounder not only mills spur gears with all rollable profiles, but is also the optimal solution for machining steering pinions and worms. with automatic loading system, extraction unit, chip conveyor, with balancing device with 2 tailstocks, with Artec process monitoring system, type CTM-BT1.1 *

Condition: used, Year of construction: 1997, Technical details: max. wheel diameter: 300 mm gear width: 110 mm max. module: 6 weight of the machine ca.: 10,5 t Bcedjxz Aw Ejpfx Aglsu *

Condition: used, Year of construction: 2001, Technical details: max. wheel diameter: 200 mm gear width: 50 mm max. module: 6 table diameter: 168,14 mm boring diameter: 65,532 mm weight of the machine ca.: 11 t Bcodjxz Avbspfx Aglou table turning speeds: 0-1.000 U/min length of stroke min./max.: 0-70 mm no. of strokes: 180-1.800 Stück *

Condition: good (used), Year of construction: 1987, operating hours: 2,685 h, functionality: fully functional, feed length X-axis: 240 mm, feed length Y-axis: 200 mm, feed length Z-axis: 400 mm, total length: 5,235 mm, total height: 3,045 mm, total width: 3,990 mm, spindle speed (max.): 640 rpm, spindle speed (min.): 55 rpm, overall weight: 11,000 kg, Equipment: documentation/manual, Gear cutting machine Pfauter PE 300 Model: SK07E 20100 Control: Sinumerik System 3 Fully functional machine, which was completely overhauled just a few years ago. Investments made: - Overhaul including milling head (2021) approx. €70,000 - All hydraulic hoses renewed (2021) approx. €3,500 - New oil mist separator (2021) approx. €5,000 Bcedpew Dcx Refx Aglou Numerous tools and clamping devices available, see pictures and attachment.

Condition: used, TECHNICAL DETAILS - Part diameter : 100 [mm] - Nominal module * gear hobbing : approx. 3.0 [mm] * endless screw milling : approx. 5.0 [mm] - Max. axial movement : 320 [mm] - Cutting head orientation : -45 / + 115 [°] - Main mill max. diameter : 118 [mm] Bcsdpfxjx Ed A Re Aglou - Max. cut out length of the mail mill : 180 [mm] - Max. mill movement (Shifting) : 160 [mm] - Max. part-holder spindle speed : 3000 [t/mm] - Min./max. distance between axes : 10/100 [mm] - Cutting head motor power : 14 [kW] - Main mill speed : 50-12000 [t/mm] - Weight : 5000 [kg] EQUIPMENT - CNC Siemens 840D - Cooling tank - Chip conveyor

Condition: good (used), Year of construction: 2005, functionality: unexamined, machine/vehicle number: 29406, Lot consists of: Bjdpov R Tmtjfx Agljcu (1)CNC Gear Shaping Machine Position consists of: (1) CNC gear shaping machine Technical Details/Technical Details: English: max dia 130mm, max face width 25mm, min/max module 0.5-4, strokes 500 - 2,500 1/min, spindle dia 85mm, CNC Siemens Sinumerik 840D, 400V 50Hz 49kW, LxWxH 6.4x4.5x4.4m, weight 12to Parts Gantry System and/or Cranes are not included in the scope. German: max. diameter 130mm, max. face width 25mm, min./max. Module 0.5-4, strokes 500-2,500 rpm, spindle diameter 85 mm, CNC Siemens Sinumerik 840D, 400 V 50 Hz 49 kW, LxWxH 6.4 x 4.5 x 4.4 m, weight 12 tons Parts gantry system and/or cranes are not included in the scope of delivery.

Condition: good (used), Year of construction: 1998, Max. Pitch circle diameter External gearing 300 mm Max. Pitch circle diameter internal gearing 300 mm Max. Outer diameter of workpiece (equipment) 450 mm max. module 6 gear hobbing width -max. 100 mm Max. Helix angle (with tool Ø 125 mm) +/- 45 ° strokes - infinitely variable 130 - 1300 Hub/min workpiece weight 1000 kg Minimum distance table top - tool spindle -55 / +300 mm Maximum distance table top - tool spindle 200 mm Maximum distance table top - tool spindle 350 mm Manual Upright side shift +/- 25 mm Manual swivelling angle of the tool spindle +/- 0,5 ° Max. Tool speed 15 UpM Max. Workpiece speed 27 UpM Max. Tool diameter 7 Zoll voltage 400 V frequency 50 Hz Max. Line power 70 A total power requirement 48 kW Bcjdpevu E Nujfx Aglsu weight of the machine ca. 11 t dimensions of the machine ca. 4,27 x 3,11 x 2,87 m taper in main spindle SK 45 table hole 40 mm control Siemens Sinumerik 840 C Gleason PFAUTER gear shaping machine Mod. PSA 300 The CNC modular gear shaping machine with skiving cutter for the machining of external and internal cylindrical gears, with straight or helical involute with straight or helical involute toothing, as well as any other profile splitting process. The work cycle is controlled by a CNC unit, with specific software for machining the gears, machining. Field of application --> The PSA 300 has been designed for the production of: - Gears with straight external teeth - Gears with straight internal teeth - Gears with external helical teeth - Gears with internal helical teeth

Condition: ready for operation (used), max. wheel diameter 150 mm gear width 1 - 200 mm Bcodpfx Asvzhg Noglju max. module 4 min. module 1 control Sinumerik 840 D table diameter 140 mm maximum axial offset 200 mm milling tool taper ISO 40 diameter of hob max. 130 mm cutter length max. 220 mm milling spindle speeds (infinitely variable) 300 - 1200 U/min shifting max. 170 mm milling head -swivable +/- 45 ° feed speeds 1 - 1500 mm/min rapid travel speed 3000 m/min max. workpiece diameter im Magazin: 150 mm total power requirement 50 kW weight of the machine ca. 8,5 t dimensions of the machine ca. 4,7 x 3,6 x 2,6 m Used gear hobbing machine, Pfauter, new in 1992 completely overhauled in 2023 by the specialist company SerWeMa, with Siemens Sinumerik 840 D control system and workpiece magazine.

Condition: used, Year of construction: 2002, functionality: fully functional, wheel diameter: 130 mm, workpiece height (max.): 170 mm, TECHNICAL DETAILS Control: Sinumerik 840D Tip diameter: 80 mm Toothed length: 170 mm Overall length of hob cutter: 245 mm Bcedpfx Agov I Tmuolju Collet diameter: 32 mm Tool speed: 300 - 3000 rpm Gear diameter: max. 130 mm Gear width: 170 mm Module: 0.5 - 3 Slide travel radial / tangential / axial: 200 / 170 / 250 mm Milling head swivel angle: ± 45° Workpiece table: Ø 168.14 mm Bore: 65.532 mm Table speed: 0 - 1000 rpm Table bore: 65.532 mm Feed X/Z: 1 - 6000 mm/min Rapid traverse X, Z / Y: 6 / 5 m/min MACHINE DETAILS Total power requirement: 48 kVA Operating voltage: 3 x 400 V, 50 Hz Machine weight: approx. 9 t Space requirement: approx. 7.64 x 3.14 x 3.25 m

Condition: excellent (used), Year of construction: 2002, functionality: fully functional, feed length X-axis: 230 mm, feed length Y-axis: 25 mm, feed length Z-axis: 150 mm, workpiece diameter (max.): 300 mm, TECHNICAL DETAILS Control: Siemens 840 D Nominal module in steel with approx. 600 N/mm² tensile strength: 4 Largest tooth width: 25 mm Largest nominal diameter: 130 mm Largest helix angle when using 125 mm diameter cutting wheels: ± 45° Bjdpswc Tg Nefx Aglocu Workpiece with internal gearing Nominal module in steel with approx. 600 N/mm² tensile strength: 4 mm Largest tooth width: 25 mm Largest swing diameter: 300 mm Largest inner diameter: 130 mm Tool Largest permissible cutting wheel diameter: 175 mm Cutting wheel holder – diameter: 1.5 inches Cutting wheel holder – taper in the shaping spindle: PKP 45 hollow steep taper – Bauer Travel paths Radial (X-axis): 230 mm Manual transverse column adjustment (Y-axis): ± 25 mm Adjustment range of the axial slide (Z-axis): 150 mm Workpiece table Outer diameter: 168.14 mm Bore: 65.532 mm Spindle spindle Largest stroke length (V-axis): 30 mm Spindle axis adjustment range: ± 0.25° MACHINE DETAILS Length: 6,435 mm Width: 4,560 mm Height: 4,400 mm Weight: approx. 11,000 kg

Condition: ready for operation (used), Year of construction: 1992, functionality: fully functional, machine/vehicle number: 27498, feed length X-axis: 230 mm, feed length Y-axis: 170 mm, feed length Z-axis: 400 mm, gear diameter: 130 mm, spindle speed (max.): 1,200 rpm, TECHNICAL DETAILS Gear diameter: max. 130 mm Gear width: 400 mm Module: 0.5 - 3 Clamping length: max. 1,160 mm Work spindle swivel angle: ± 45° Tool change swivel angle: 90° Workpiece Largest module (in steel with approximately 600 N/mm²): 4 Largest swing diameter (not millable): 480 Smallest number of millable teeth: 3 Tool Largest hob diameter: 130 mm Largest cutter length (depending on cutter arbor diameter): 220 mm Cutter arbor diameter: 16 / 22 / 27 / 32 mm Cutter arbor taper: ISO Workpiece spindle – WS External turning range: 160 mm Bore: 63 mm Tailstock – RT Motorized travel (W-axis): 750 mm Bcjdpfx Agjwc Tduslju Quill stroke (hydraulic): 90 mm Axis travels X-travel: 230 mm Y-travel: 170 mm Z-travel: 400 mm Spindle Cutter speed (infinitely variable): 300 – 1,200 rpm Workpiece spindle speed range: 1 – 125 rpm Control system Control system: Bosch CC 220 MACHINE DETAILS Total power requirement: 52 kW Machine weight: approx. 7.5 t Machine dimensions: approx. 4,800 × 3,800 × 2,500 mm Space required: 7.3 x 5.3 x 4.3 m Operating voltage: 380 V Control voltage: 220 V V Frequency: 50 Hz Machine power consumption: approx. 56 kVA EQUIPMENT - Bosch CC 220 CNC control - Continuously variable cutter speed control - Large travel range in all axes - High flexibility thanks to a wide range of modules

Condition: used, Year of construction: 1979, max. wheel diameter 350 mm gear width 350 mm max. module 8 Bodet Hwxzspfx Aglecu min. module total power requirement 7,5 - 22 kW weight of the machine ca. t dimensions of the machine ca. m Gear hobber with gear shaping device, 2-cut cycle

Year of construction: 1970, condition: ready for operation (used), Wheel diameter: 160mm, max. wheel width: 355mm, module range: 0.5-4.5, max. cutter diameter: 115mm, max. cutter length: 105mm, cutter head swivel range: 120°, speed: 400rpm, distance between centers: 410mm. Machine dimensions X/Y/Z: approx. 2000mm/1500mm/2000mm, weight: approx. 3500kg. An on-site inspection is possible. Bcodpfx Agoxph Skslou

Condition: ready for operation (used), Three milling heads for different machines of the brand Pfauter-Gleason are available. 1) Milling head for Gleason Genesis 130H. 2) Milling head for Pfauter P200, without counter bearing. 3) Milling head for Pfauter PE250. An on-site inspection is possible. Bcjdpfsxl Upzex Aglou

Condition: like new (used), Year of construction: 2004, More Photos coming soon hob cutter: -Largest permissible tip circle diameter: 80 mm Largest toothed length: 70 mm Largest total length: 240 mm Taper for trimming with counter bearing steep taper 1:3, 4286 Mounting diameter of the collet: 32 mm Sliding paths: Radial (X-axis): 100 mm Tangential (Y-axis): 160 mm Axial (Z-axis): 300 mm Tailstock (Z4 axis): 350 mm Loading gantry (X5 axis) 3800 mm Largest milling head swivel angle: Direction +A: 40 degrees Direction A: 40 degrees Workpiece spindle: Outer diameter: 160 mm Bore: 63 mm Overall dimensions of the machine: Length: 9130 mm Width: 3895 mm Height: 3200 mm Gain of the machine: 8400 kg Feed rates: X and Z axes: 1 to 10000 mm/min Y axis: 1 to 5000 mm/min Rapid traverse: X, Z and Z4 axes: 10000 mm/min Y axis: 5000 mm/min X5 axis: 150 mm/min Speeds: Tool: 300 to 4000 min^-1 Workpiece spindle: 0 to 1000 min^-1 Operating voltage: 400 V Supply voltage: 230 V Control voltage: 24 V Frequency: 50 Hz Connected load of the machine: 48 kVA Cable cross-section: 35 mm2 Fuse protection: 70A Bodpfx Agoqpf Ifsljcu wälzfräser: -Großter zulassiger Kopfkreissdurchmesser: 80 mm Groste verzanne Lange: 70 mm Größte Gesamtange: 240 mm Kegel zum Abstutzen m Gegenlager Steilkegel 1:3, 4286 Aufnahmedurchmesser der Spannzange: 32 mm Schlitterwege: Radial (X-Achse): 100 mm Tangential (Y-Achse): 160 mm Axial (Z-Achse): 300 mm Reitstock (Z4-Achse): 350 mm Ladeportal (X5-Achse) 3800 mm Größter Fräskopfschwenkwinkel: Richung +A: 40 Grad Richtung-A: 40 Grad Werkstückspindel: Außendurchmesser: 160 mm Bohrung: 63 mm Gesamtabmessungen der Maschine: Lange: 9130 mm Breite: 3895 mm Höhe: 3200 mm Gewinnt der Maschine: 8400 Kg Vorschübe: Achsen X und Z: 1 bis 10000 mm/min Achse Y: 1 bis 5000 mm/min Eilgänge: Achsen X, Z und Z4: 10000 mm/min Y.Achse: 5000 mm/min X5-Achse: 150 mm/min Drehzahlen: Werkzeug: 300 bis 4000 min^-1 Werkstückspindel: 0 bis 1000 min^-1 Betriebsspannung: 400 V Versorgungspannung: 230 V Steuerspannung: 24 V Frequenz: 50 Hz Anschlußwert der Maschine: 48 kVA Kabelquerschnitt: 35 mm2 Absicherung: 70A

Condition: excellent (used), Year of construction: 1991, functionality: fully functional, Machine still under power and production can be seen at any time. Technical Data – PE 150 This hobbing machine with automatic workpiece change system is designed for series production of workpieces, for which the corresponding drawings have been received. Our specialists for automatic workpiece changing systems will gladly assist you if you wish to convert the machine for milling different workpieces. Hob Cutter: Max. permitted cutter outside diameter: 130 mm Max. length (depending on cutter arbor diameter): 220 mm Slide Travel: Radial (X-axis): 150 mm Tangential (Y-axis): 170 mm Axial (Z-axis): 200 mm Bcsdpfx Asu N E Rroglju Max. Swivel Angle of Milling Head: In +A direction: 30° In -A direction: 45° Workpiece Table: Outer diameter: 160 mm Bore diameter: 63 mm Overall Dimensions of the Machine: Length: 5,820 mm Width: 4,047 mm Height: 2,810 mm Approximate Weight of Machine: 8,000 kg Speeds: Feeds: Axes X, Y, and Z: 1 to 3,000 mm/min Rapid Traverses: Axes X, Y, and Z: 3,000 mm/min Spindle Speeds: Tool (S-spindle): 150 to 600 rpm Workpiece table (C-axis): 1 to 125 rpm Electrical Equipment: Operating voltage: 400 V Supply voltage: 230 V Control voltage: 24 V Frequency: 50 Hz Connected load of the machine: 48.5 kVA Cable cross-section: 25 mm² Fusing: 100 A

Year of construction: 1984, condition: ready for operation (used), A Pfauter vertical CNC gear hobbing machine is available. Modules min./max.: 1/3, max. workpiece diameter: 150mm, max. tooth width: 150mm, milling head tilt: +/-45°, milling cutter axis-table axis distance: 10mm-160mm, table diameter: 160mm, table bore: 63mm. Tool holder: SK40, max. cutter diameter: 130mm, max. cutter length: 220mm, speed: 600rpm, feed: 1500mm/min, tangential path: 170mm, rapid traverse: 3m/min. Machine dimensions X/Y/Z: approx. 4000mm/3000mm/2500mm, weight: approx. 6500kg. On-site inspection is possible. Bcjdjwkih Eopfx Agleu

Condition: reconditioned (used), Year of construction: 1991, functionality: fully functional, machine/vehicle number: 27604, feed length Y-axis: 170 mm, feed length Z-axis: 200 mm, table diameter: 160 mm, spindle speed (max.): 600 rpm, TECHNICAL DETAILS X-axis: 150 mm Y-axis: 170 mm Z-axis: 200 mm Swivel angle: -150/30° Bedpfx Asv Rdwiegljcu Milling unit Max. hob diameter: 130 mm Max. hob length (shaft mill): 220 mm Max. module: 3 Cutter length: max. 220 mm Cutter speeds: continuously variable up to 600 rpm Milling arbor diameter: 32 mm Table Table diameter: 160 mm Table bore diameter: 63 mm Control & Retrofit Control: SINUMERIK 840 D SIEMENS Retrofit: Sinumerik 840 D / Windows XP Pro in 2010 MACHINE DETAILS Total power requirement: approx. 20 kW Machine weight: approx. 10,500 kg Space required: approx. 6.8 x 3.7 x 2.85 m

Condition: like new (used), Year of construction: 2017, max. wheel diameter 100 mm gear width 26 mm max. module 31 min. module 0,1 Control Siemens 840 D SL Number of working hours 9598 h total power requirement 45 kW weight of the machine ca. 7 t dimensions of the machine ca. 4x3x2,5 m Gleason 100S gear shaping machine for the production of internally and externally toothed cylindrical gears and other cylindrical workpiece circumference regularly occurring profiles and moulds as well as for the production of profiles using the single part process. Technical data: Nominal workpiece diameter 100 mm Largest circumferential diameter 150 mm Machine nominal module approx. 3 mm Bsdpfxjv Ehbbe Aglscu (Guide value depending on the respective machining task.) Shaping spindle stroke speed range 0 - 3,000 1/min Stroke position adjustment range (manual) 20 mm Largest toothing width 26 mm Smallest pitch height of the hydrostatic inclined guide 400 mm Smallest/largest distance between tool axis - 20/+ 180 mm and workpiece axis Stand inclination range (manual) - 1/+ 11° Tool holder (manual clamping) HSK-D63 (hollow shank taper according to DIN 69063) Weight of the machine approx. 7,000 kg with robot cell

Condition: excellent (used), Year of construction: 2007, Gleason Pfauter G130H CNC vertical gear hobbing machine Control, Siemens 840D Year of manufacture, 2007 Capacity Maximum workpiece diameter, about 130 millimetres Maximum gear width, about 170 to 180 millimetres Maximum module, up to module 3 or 4 depending on the configuration Minimum module, about module 0 point 5 Hob head Hob spindle power, about 11 point 5 to 14 kilowatt Hob speed range, about 10 to 4000 revolutions per minute Hob head swivel, about plus and minus forty five degrees Maximum hob diameter, about 100 millimetres Maximum hob length, about 240 to 317 millimetres Hob shift travel, about 170 to 220 millimetres Axis travels X axis travel, about 200 millimetres Y axis travel, about 170 millimetres Z axis axial slide travel, about 250 to 350 millimetres Work spindle and table Work spindle speed, about 0 to 1000 revolutions per minute Table diameter, about 160 to 168 millimetres Table bore, about 65 millimetres Maximum clamping length, about 245 millimetres Hydraulic clamping included in most units Process Wet cutting External gear hobbing Two cut cycles and taper or crown hobbing possible ISO thirty hob arbor Optional automatic loading systems Electrical and general Machine weight 11 tons Overall footprint, roughly three metres by three metres with guarding Bjdpfx Agjxxzqljljcu

Condition: like new (used), Year of construction: 2021, functionality: fully functional, inner diameter: 250 mm, outer diameter: 300 mm, For the production of internally and externally toothed cylindrical gears and other rolling profiles and shapes that regularly occur on the cylindrical workpiece circumference, as well as for the production of profiles using the single part process. incl. robot automation: coordinated Fanuc robot for loading and unloading TECHNICAL DETAILS CNC control: Siemens SINUMERIK 840 D sl External toothing: 300 mm Internal toothing: 250 mm Largest workpiece orbital diameter: 450 mm Nominal machine module: 8 mm Largest toothing width: 100 mm Shaping spindle stroke rate range Special version: 85 - 850 rpm Spindle diameter: 95 mm Mounting: HSK-B80 taper Distances and adjustment ranges Smallest pitch height of the hydrostatic inclined guide: 400 mm Smallest/largest distance between tool and workpiece axis: -70 / +230 mm Stroke position adjustment range (manual): 75 mm Stand lateral offset range: ±25 mm MACHINE DETAILS Weight of the machine: approx. 7,000 kg CONTROL AND DRIVE CNC control: Siemens SINUMERIK 840 D sl Control group: NCU 720.3PN with PLC 317-3PN/DP Drive system: SINAMICS S120 (digital drive technology) Measuring systems: - Absolute encoders for linear and rotary axes (except endless rotary axes) - Incremental measuring systems for C-axis NC axes: - Spindle stroke drive (A) - Workpiece rotation (C) - Tool rotation (C2) - Radial axis (X) shank and tool table Max. Shaping spindle speed: 12 rpm Bcodpfsvdtx Njx Agleu Max. Table speed: 300 rpm Max. Table torque: 220 Nm Table bore: diameter 150 mm, depth 253 mm Free support diameter: 365 mm (4 T-slots, M12 threaded holes) Radial drive: Max. Feed speed: 3,000 mm/min COOLING AND LUBRICATION SYSTEM Coolant tank capacity: approx. 550 l Cutting wheel cooling lubricant delivery rate: approx. 150 l/min Magnetic chip conveyor: - Nominal width: 230 mm - Discharge height: approx. 900 mm Lubrication and hydraulic system Tank volume: approx. 160 l Number of pumps: 2 (lubrication, hydraulic and hydrostatic) POWER SUPPLY Operating voltage: 400 V Control voltage: 24 V DC Frequency: 50 Hz Total connected load: approx. 25 kVA PROGRAMMING Standard dialog program: plain text operator guidance (German, English, Italian) Program functions: Single-cut cycle Multi-cut cycle (max. 3 cuts) Dimensional corrections Linear or degressive infeed EQUIPMENT 1 basic machine(s) AM 250 1 power clamping device 1 main column intermediate plate (150 mm high) 1 special ram head 0 - 110 mm stroke length 1 HSK-B80 tool holding cone 1 counter column with fixed counter support arm 1 counter column intermediate plate (100 mm high) 1 set of vibration isolators at no extra charge 1 Electronic handwheel 1 Extended software for fault diagnosis at no extra charge 1 Internet diagnostics system 1 Flow monitor 1 Flushing gun 1 150 mm diameter pipe socket 1 counterholder tip - rotating 1 draw tube and attachment bush AUTOMATION: 1 standard interface 1 Internal flushing of clamping top parts 1 Automatic loading door