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Dyson DC21 Service Manual
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Dyson DC21 Service Manual

Dyson DC21 Service Manual

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service manual
Issued 04/07

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Summary of Contents for Dyson DC21

  • Page 1 service manual Issued 04/07...
  • Page 2 No running costs Lifetime washable filter and no bags to buy. 5 year guarantee Parts and labour guaranteed by Dyson for 5 years. Flexible steering Shrinks to store away Cleaner head steers easily Hose and wand compress and around obstacles.
  • Page 3 service manual Introduction Technical Electrical safety testing Electrical overview Electrical fault diagnostic Wiring schematic Fitting notes General notes Main body - dismantle Main body - assemble Sub-assemblies - power wand/hose assembly Sub-assemblies - power floor tool assembly - dismantle Sub-assemblies - power floor tool assembly - assemble Parts recognition Pre-filter cover &...

  • Page 4: Electrical Safety Testing

    Live electrical supply. Insulation test The following tests must be performed prior to and upon completion of all repairs to Dyson floorcare products and before any functional checks. You must ensure that a full visual inspection of the product is completed prior to repair.

  • Page 5: Electrical Overview

    service manual A reading of > 2MΩ is accepted. 2MΩ is the minimal legal requirement. A reading of below 2MΩ is not considered safe and further investigation and rectification must be made before the product is used. The following components must be visually inspected: •...
  • Page 6 service manual Electrical fault diagnostic Note: check ‘points’ refer to the wiring schematic on page 4. No power to either motor 1. Check for damage/electrical failure to the plug and powercord. 2. Carry out a resistance test across the fuse. A reading of <1 should be expected.
  • Page 7 service manual Wiring schematic...

  • Page 8: General Notes

    Please ensure that safety goggles are worn at all times whilst servicing Dyson vacuums. Where this symbol is shown, ensure ESD protection is used.
  • Page 9 service manual Unclip the post filter cover catch using a flat bladed screwdriver. Carefully remove the cover and filter. Unclip the pre-filter cover from the locating point on the upper motor cover (UMC). Pull the pre-filter cover away from the machine until it releases from the hinge points.
  • Page 10 service manual Should any parts of the bleed valve need Press the lower retaining clip from inside the replacing, carefully push out from the UMC to remove the cable collar. outside of the UMC using a thin, flat Separate the collar from the powercord. bladed screwdriver.
  • Page 11 service manual The motor bucket mount can be replaced if necessary as shown. When fitting ensure the mount is correctly located within the channel on the motor bucket. Release the cable rewind from the lower motor cover (LMC) assembly. Unclip the fly leads from around the side of the motor bucket.
  • Page 12 service manual Release the switch holder from the LMC assembly. Then prise a thin, flat bladed screwdriver under the cyclone inlet and slide the inlet off the LMC assembly. To refit, slide onto the LMC assembly, refit the screw and neatly dress the loom within the ribs. Release the switch from the switch holder.
  • Page 13 service manual Prise the castor wheel and axle out of the castor body using a thin, flat bladed screwdriver. To refit, clip into the castor body. Prise the castor body away from LMC using a large flat bladed screwdriver. To refit, push firmly onto the castor spigot.
  • Page 14 service manual Main body assemble Ensure the detail on the motor mount locates into the end of the motor bucket. Refit the wiring harness into the motor bucket if previously removed. Ensure the grommet is adequately sealed. Fit the fancase seal onto the base of the motor. Fit the motor mount onto the motor plate.
  • Page 15 service manual Position the switch holder into the LMC assembly. When positioned correctly the switch button will point directly upwards. Carefully attach the wires from the cable rewind assembly and cyclone inlet assembly onto the PCB assembly. Locate the cable rewind assembly into the LMC assembly.
  • Page 16 service manual Carefully attach the wiring harness to the PCB assembly. Locate the PCB assembly into the channels in the LMC assembly. Retaining clip Channel Locate the plug through the UMC. Position the LMC vertically. Locate the UMC onto it ensuring that the UMC grille is seated centrally Side wall around the fancase seal.
  • Page 17 service manual Refit the pre-filter assembly into the top of the UMC. Clip the pre-filter cover into the hinge Firmly press the wheels onto the side of the points on the rear of the UMC. Clip the product. pre-filter cover catch over the retainer on the front of the UMC.
  • Page 18 service manual Sub-assemblies - power wand/hose assembly The wand handle cover can be replaced by removing the Torx T-8 screw in the rear of the cover. To remove the wand handle from the power wand hose assembly, undo the 2 screws on the top of the wand.
  • Page 19 service manual To refit, locate the spring onto the cruciform To fit, locate the detail on the rear of the on the underside of the catch, then lower cover under the lip on the wand. Lower the the catch onto the wand ensuring the spring cover onto the wand.
  • Page 20 service manual Sub-assemblies - Power floor tool assembly - dismantle Carefully prise the microswitch cam and spring out of the neck. The stow wheel or axle can be replaced by prising out of the stow using a thin, flat bladed screwdriver. To fit, push both parts firmly into the stow.
  • Page 21 service manual The axle, other wheel hub and glamour cap and remaining washers can then be removed from the side of the floor tool if necessary. If either outer wheel hub, glamour cap or the axle need replacing, prise the relevant glamour cap off the wheel hub using a thin, flat bladed screwdriver.
  • Page 22 service manual The soleplate wheels or axles can be prised out from the soleplate assembly if necessary using a thin, flat bladed screwdriver. Turn the endcap fasteners counter-clockwise To fit, firmly press both parts into the using a large, flat bladed screwdriver or coin. soleplate assembly.
  • Page 23 service manual The bumper strip can be replaced by pushing Disconnect the 2 brushbar motor wires from very firmly away from the front of the brush the connectors. housing. Carefully release the brushbar microswitch Undo the 3 screws in the brushbar motor loom from the rubber retainer on the rear of cover lower.
  • Page 24 service manual If the brushbar actuator needs replacing, Remove the brushbar motor from the brush release the lip of it firmly from the housing. brushbar motor cover using a large, flat Note: it may be necessary to use a bladed screwdriver. screwdriver to carefully ease the motor out.
  • Page 25 service manual Undo the 2 screws in the top of the brushbar motor cover. If the brush housing needs replacing, slide it away from the front of the brushbar motor cover. Remove the brushbar motor front mount from the front of the brush housing. Remove the ropeseal if not done previously.
  • Page 26 service manual Sub-assemblies - Power floor tool assembly - assemble Slide the brush housing under the brushbar motor cover and into the neck. Locate the front of the brushbar actuator into Refit the 2 screws. the top of the brushbar motor cover. Then force the rear of the actuator into the cover.
  • Page 27 service manual Firmly press the brushbar microswitch holder Locate the brushbar motor front mount into over the retaining peg on the brushbar motor the front of the brush housing. cover. Brushbar microswitch loom Ensure the motor wires sit under the motor brushes. Brushbar motor end mounts Transmission manifold Ensure the brushbar motor wires are looped under the motor brushes.
  • Page 28 service manual Ensure if previously removed that all lengths of ropeseal are fitted into the edges of the Carefully locate the brushbar microswitch brush housing. loom behind the rubber retainer on the rear of the brushbar motor. Press the bumper strip firmly onto the front of the brush housing if previously removed.
  • Page 29 service manual Locate the 2 halves of the brushbar assembly into the transmission of the brushbar motor. Locate the endcap assemblies onto the ends of the brushbar assembly. Twist into position on the brush housing. Twist the endcap fasteners clockwise to lock in position.

  • Page 30: Motor Assy

    service manual Pre-fi Pre-filter cover & UMC assy Upper Pre-filter Seal Exhaust Seal Pre-filter Cover Assy Screw Cable Rewind Actuator Bleed Valve Housing Spring Lower Pre-filter Seal Bleed Valve Cap Pre-filter Bleed Valve Assy O-Ring Switch Actuator Spring Spring Cable Collar PCB Bleed Pipe Elbow Cable Rewind Bleed Pipe Cable Rewind Bleed Pipe Elbow...
  • Page 31 service manual LMC assy Post Filter Cover Cable Rewind Assy Assy Switch Switch Holder HEPA Filter Assy PCB Assy HEPA Seal Rear Wheel Assy Bumper Strip Castor Body Screw Castor Roller Cyclone Inlet/ Loom Assy Axle Cyclone & bin assy Cyclone Assy Bin Assy...
  • Page 32 service manual Power floor tool assy Screw Gimble Cover Axle Brushbar Actuator Washer Spring Glamour Cap Stow Microswitch Cam E-Clip Screw Outer Wheel Hub Stow Neck Cover Stow Wheel Internal Hose Assy Axle End Cap Assy Right Brushbar Motor Brush Housing Assy Brushbar Motor End Mount...
  • Page 33 service manual Power wand/hose assy Screw Wand Handle Cover Wand Handle Screw Screw Instruction Pack Power Wand Hose Assy Wand Cuff Cover Screw Mini Turbine Head Assy Hard Floor Tool Assy Brush Stair Tool Tool Crevice Assy Assy Tool...