Husqvarna K1270 II Workshop Manual
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Husqvarna K1270 II Workshop Manual

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Workshop manual
K1270 II
English
1273 - 001 - 04.11.2019

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Summary of Contents for Husqvarna K1270 II

  • Page 1 Workshop manual K1270 II English 1273 - 001 - 04.11.2019...

  • Page 2: Table Of Contents

    4.2 Servicing tools overview........11 4.3 Servicing tools overview........12 5 Product overview for repair and servicing 5.1 Components K1270 II.......... 13 5.2 Components K1270 II Rail........14 5.3 Basic modules of the product.......15 6 Repair and servicing 6.1 Starter..............23 6.2 Ignition system............. 26 6.3 Flywheel...............

  • Page 3: Introduction

    1.2 Outline This manual is for K1270 II Rail Vac and Dry Cut. Most chapters are applicable to the two models. The chapters that are applicable for only one model has that model name included in the title.

  • Page 4: Safety

    2 Safety 2.1 Safety definitions Read the manual carefully and make sure you understand the instructions before Warnings, cautions and notes are used to point out using the product. specially important parts of the manual. WARNING: Used if there is a risk of injury or Always put on personal protective death for the operator or bystanders if the equipment:...

  • Page 5: Servicing Data

    3 Servicing data 3.1 Symbols in the diagrams Tightening torque, Nm 1273 - 001 - 04.11.2019 Servicing data - 5...

  • Page 6: Tightening Torques

    3.2 Tightening torques 17-23 10-12 20-33 6 - Servicing data 1273 - 001 - 04.11.2019...
  • Page 7 3 - 4 11 - 13 1 - 1,4 17 - 23 10 - 18 15 - 17 10 - 14 8 - 9 1273 - 001 - 04.11.2019 Servicing data - 7...
  • Page 8 10-12 20-33 10-12 20-33 38-42 2-10 8 - Servicing data 1273 - 001 - 04.11.2019...
  • Page 9 35-40 9 -11 9-11 8-11 35-40 8-11 5 - 6 1273 - 001 - 04.11.2019 Servicing data - 9...

  • Page 10: Servicing Tools

    4 Servicing tools 4.1 Servicing tools overview Designation Used for Order No./Source tion Sealing plug To examine the crankcase for leaks. 503 55 22-01 Bearing press To assemble the primary bearing. 506 37 61-02 Press tool To disassemble and assemble the blade shaft bearings and axle. 575 96 20-01 Puller To disassemble the sealing rings of the crankcase in the crank- 504 91 40-01...

  • Page 11: Servicing Tools Overview

    4.2 Servicing tools overview Designation Used for Order No./Source tion Grip plate To divide the crankcase. 544 06 00-02 Bearing puller Remove the primary bearing from the crankshaft. 531 00 48-67 Bearing press To disassemble the primary bearing and assemble the crankshaft. 544 10 36-02 Combination wrench General.

  • Page 12: Servicing Tools Overview

    4.3 Servicing tools overview Designation Used for Order No./ Source tion Test spark plug To do servicing on the ignition unit 502 71 13-01 Air clearance gauge To adjust the air clearance between the ignition module and the fly- 502 51 34-02 wheel.

  • Page 13: Product Overview For Repair And Servicing

    5 Product overview for repair and servicing 5.1 Components K1270 II 1. Decompression valve 13. Stop switch 2. Water connection with filter 14. Air purge bulb 3. Fuel tank cap 15. Throttle trigger 4. Rear belt guard 16. Throttle lock 5.

  • Page 14: Components K1270 Ii Rail

    5.2 Components K1270 II Rail 1. Rear handle 17. Starter housing 2. Fuel tank cap 18. Starter rope handle 3. Decompression valve 19. Air intake 4. Rear belt guard 20. Stop switch 5. Installation point for rail fixture 21. Air purge bulb 6.

  • Page 15: Basic Modules Of The Product

    5.3 Basic modules of the product This chapter shows how to disassemble the product into basic modules K1270 II K1270 II K1270 II Rail K1270 II Rail 1273 - 001 - 04.11.2019 Product overview for repair and servicing - 15...
  • Page 16 5.3.1 To remove the starter 3. Loosen the belt tension with the adjuster screw. 1. Remove the 4 screws on the guard. 2. Remove the starter. 4. Remove the 2 screws. 5.3.2 To remove the cutting head 1. Open the hose clip with a screwdriver. 5.
  • Page 17 6. Remove the nut and the rear belt guard. 5.3.3 To remove the cutting arm To remove the 1. Remove the cutting head. Refer to cutting head on page 16 . 2. Remove the 3 screws and the nut. 7. Remove the cutting head. 5.3.4 To remove the air filter CAUTION: Be careful when the air filter is removed.
  • Page 18 3. Loosen the center screw. Remove the air filter. 5.3.6 To remove the carburetor To remove the 1. Remove the cylinder cover. Refer to cylinder cover on page 18 . 2. Remove the throttle cable end from the throttle lever. 3.
  • Page 19 5. Remove the inlet hose. 8. Remove the choke and remove the carburetor. 5.3.7 To remove the air duct To remove the starter 1. Remove the starter. Refer to 6. Remove the gasket. on page 16 . 2. Remove the cable lug for the stop switch cable. 7.
  • Page 20 4. Push the ignition cable through the air nozzle. 3. Remove the 2 screws that hold the support plate. 5. Remove the air duct. 5.3.9 To remove the inlet manifold To remove the 1. Remove the carburetor. Refer to carburetor on page 18 . 2.
  • Page 21 4. Loosen the screw. 8. Remove the flange from the inlet manifold. 5.3.10 To remove the inlet nozzle To remove the 1. Remove the cylinder. Refer to cylinder on page 42 . 2. Turn the flywheel to get access to the screw for the inlet nozzle.
  • Page 22 3. Remove the cable clamp for the throttle cable from 8. Remove the engine unit from the handle unit. To remove the throttle the throttle lever. Refer to trigger and throttle lock on page 62 . 4. Remove the tube to the air purge bulb. Refer to remove the carburetor on page 18 .

  • Page 23: Repair And Servicing

    6 Repair and servicing 6.1 Starter 3. Remove the starter rope from the starter pulley. 6.1.1 To remove the starter rope 1. To remove the spring force from the return spring, pull out the starter rope approximately 12 in/30 cm. Hold the starter pulley with your thumb and put the starter rope in the notch on the starter pulley.
  • Page 24 6.1.2 To attach the new starter rope 6.1.3 To apply tension to the return spring 1. Put one end of the starter rope from the top through 1. Put the starter rope in the notch. the hole in the starter pulley. Then pull it out through 2.
  • Page 25 3. Remove the cable pulley. Note: Make sure that the spacer sleeve does not fall off. 1. Align the starter pulley notch with the end of the return spring. 2. Put the center bolt into the starter pulley assembly. 4. Remove the plate above the return spring with a screwdriver.

  • Page 26: Ignition System

    6.1.7 To examine the starter pawls 3. Bend the end of a thin steel wire. Use it to pull the spring to the mounting on the opposite side. Note: Do not lubricate the starter pawls. 1. Make sure the springs work and the starter pawls move freely.
  • Page 27 The ignition system has a primary coil (1) and a 6.2.2 Ignition unit secondary coil (2). They are wound around an iron core The ignition unit is sealed and cannot be repaired. The (3). An electronic digital unit (4) controls the switch spark plug cable, the contact unit to the spark plug and function.
  • Page 28 6.2.6 To examine the ignition cable Note: An electrode with soft edges and damaged ceramic around it can cause pre-ignition. You must 1. Pull up the rubber seal by the ignition unit and replace a spark plug with soft edges. remove the ignition cable.
  • Page 29 6.2.7 To examine the short circuit cable and the 6.2.8 To remove the stop switch stop switch 1. Remove the screw and the cable. 1. Remove the starter and the short circuit cable on the ignition unit. 2. Pull out the the switch approximately 10 mm (A). 2.

  • Page 30: Flywheel

    6.3.1 To remove the flywheel Servicing Use a Husqvarna flywheel puller. Refer to tools overview on page 12 . 1. Remove the starter and the lower air duct. 2. Loosen the springs and put the starter pawls in their outer positions.

  • Page 31: Air Filter

    5. Hold the handle of the flywheel puller to lock the 6.3.2 To examine the seat and key flywheel. Remove the nut and the washer. The key in the flywheel can not be replaced. If the key is damaged the flywheel must be replaced. For a correct 6.
  • Page 32 before they can go into the tube. Only small dust CAUTION: Make sure that dust does not fall particles go with the air to the inlet. into the carburetor inlet. 2. Clean and examine the inlet duct. 6.4.2 To replace the filter When the power starts to decrease, replace the air filter.

  • Page 33: Fuel System

    If the pressure is constant, the fuel system has no leakage. If the pressure drops, go to the next step. 2. Catch the fuel hose with a Husqvarna fuel filter hook. 3. To make sure that the fuel hose does not cause the leakage, remove the carburetor unit.
  • Page 34 (B). This means that the fuel level in the carburetor does not become too high. 6.5.10 To do a test of the air purge bulb A Husqvarna test instrument for fuel lines and check Servicing tools overview valves is necessary. Refer to on page 12 .
  • Page 35 If the air purge bulb does not fill with fuel when you push 6.5.11 To remove the air purge bulb it, do this procedure. 1. Remove the return hose and carburetor hose from the air purge bulb. 1. Connect the test instrument to the hose from the air purge bulb.

  • Page 36: Carburetor

    6.6 Carburetor 6.6.1 Carburetor components 6.6.2 Pressure tester 1. Lever for the start throttle 2. Connection to the air purge bulb The pump piston of the pressure tester (refer to 3. Fuel line from the fuel tank Servicing tools overview on page 12 ) must be operated with one hand.
  • Page 37 6.6.3 Needle valve 6.6.3.4 To do a test of the needle valve 1. Connect the pressure tester to the fuel line. 6.6.3.1 Indications of a needle valve leak There are many symptoms of a needle valve with a leak. A product that is used for short periods is usually not easy to start when it is warm.
  • Page 38 6.6.3.6 To examine and clean the needle valve top of the pump diaphragm. The fuel below the diaphragm is pushed to the valves (B). Pressure from 1. Remove the needle valve. the measurement chamber diaphragm to the needle valve in the measurement chamber controls how much the valve opens.
  • Page 39 and a fuel chamber to the carburetor body. The air 6.6.7 To examine the measurement chamber chamber and the fuel chamber are divided by the diaphragm measurement chamber diaphragm. The diaphragm 1. Disassemble the measurement chamber. controls and keeps a constant level of fuel in the fuel chamber through the mechanically connected needle valve.
  • Page 40 6.6.8 To examine the fuel strainer 3. Clean the channels with compressed air. The rings show where to blow clean. 1. Examine the fuel strainer with a magnifying glass. 2. Remove loose dirt particles from the needle valve seating with air. Replace the fuel strainer if it is damaged.

  • Page 41: Decompression Valve

    valve (A). The valve closes because of the combustion Note: Do not connect the tachometer directly to the pressure when the engine fires. (B). ignition system. The tachometer senses the magnetic field from the ignition system. Note: Do not remove the air filter cover. WARNING: Adjust the idle speed outdoors.

  • Page 42: Cylinder And Piston

    To install 4. Install the decompression valve, refer to The average for a new engine is approximately 7.5 the decompression valve on page 42 . bar/110 psi. Values less than 5.5 bar/80 psi show faults with or on the cylinder, piston or piston rings. 5.
  • Page 43 4. Push out the wrist pin by hand. If it is tight, use a Note: Do not use the piston stop on this product. small hammer and light force. 1. Put the support plate below the piston. 5. Remove the piston. 6.

  • Page 44: Piston Wear

    been broken through. Aluminium from the piston can be 6.8.6.2 Piston ring groove removed using emery cloth. If the piston ring groove is larger than 0.06 in./1.6 mm, the piston must be replaced. Install a complete piston kit with piston rings, needle bearing and wrist pin. 6.8.5 To examine the piston The bottom of the piston, near the inlet and exhaust 6.8.6.3 To examine the piston ring for wear...
  • Page 45 Oil on the piston rings shows correct lubrication. The exhaust side. Look for scoring damage in combination piston rings can move freely in the piston ring groove. with a piston top that has become too hot. 6.9.2 Dust 6.9.4 Too hot piston top If dust enters the engine, the engine life decreases.

  • Page 46: To Assemble The Piston

    6.10 To assemble the piston 3. Install a snap ring in the piston. Lubricate new or cleaned bearings and piston rings with 2-stroke oil before you assemble them. 1. Make sure that the arrow on the piston points in the direction of the muffler when you assemble the 4.

  • Page 47: To Assemble The Cylinder

    6.11 To assemble the cylinder 5. Push down the cylinder on the piston and let the piston ring compressor move along the piston. 1. Clean and remove remaining bits of the first gasket Tighten the screws crosswise to a torque of 10–11 from the surfaces that connect with the gasket.
  • Page 48 12 . There is also a sealing plug that replaces 6.12.2 To remove the crankcase seal the decompression valve. To replace the crankcase seal rings, use a Husqvarna Servicing tools puller and an assembly punch. Refer to Use a pressure tester or equivalent for the test, refer to overview on page 10 .
  • Page 49 6.12.5 To disassemble the crankcase Divide the crankcase with a universal puller and a grip Servicing tools overview plate from Husqvarna. Refer to on page 10 and Servicing tools overview on page 11 . 1. Disassemble the basic modules from the crankcase.
  • Page 50 3. Put the grip plate above the hole for the crankshaft 6. Make sure there is no radial play on the connecting and push out the crankshaft with the puller. rod by the crankshaft journal. If there is radial play, the unit must be replaced.
  • Page 51 Servicing use 2 Husqvarna bearing press kits, refer to 3. Put the crankcase halves against a flat piece of tools overview on page 11 . wood or equivalent. Use a hot air gun around the bearing, maximum 100°C /212°F. 1. Put the puller plate behind the bearing.
  • Page 52 5. Remove the bushings for the crankcase halves. 6.12.8 To assemble the crankcase Servicing tools Use a Husqvarna bearing press, refer to overview on page 11 . 1. Lock the crankcase half. The bottom of the cylinder plane must be down. This makes sure that the connecting rod does not push on the crankcase when you assemble the crankcase.
  • Page 53 5. Put the bushings in the holes. 7. Assemble the other crankcase half in the same procedure as the first crankcase half. 6. Install the new crankcase gasket. a) Change to the mandrel with M10V threads. b) Make sure that the position of the connecting rod is correct.

  • Page 54: Clutch

    15 Nm. Make sure that the crankshaft moves freely 6.13.1 To remove the clutch after it is assembled. Hit the ends of the shaft with a To remove the clutch, use a Husqvarna piston stop, small plastic hammer to release tension. Servicing tools overview on page 11 .
  • Page 55 3. Pull the clutch drum from the axle. Make a note of clutch. If it is necessary, replace with a full clutch the position of the washer against the bearing assembly. nearest the crankcase. 2. Measure the inner diameter of the clutch drum. 6.13.2 To examine the clutch for wear The inner diameter of the clutch drum must not be Repair the clutch if the cutting blade is engaged at...
  • Page 56 3. Remove the spring with a small screwdriver or a pin 6.13.7 Belt pulley bearings punch. The clutch drum and belt pulley are connected units. The belt pulley has two permanently lubricated ball bearings that are adjacent to each other without spacers.
  • Page 57 3. Put the hex key in a vise. Put the head of the screw 6.13.9 To install the belt pulley bearings on the hex key. Put the socket and cover in position. 1. Put the support plate of the bearings in a vise. Put Install the washer and the nut.

  • Page 58: Cutting Head

    6.14 Cutting head 4. Remove the pulley. 6.14.1 To disassemble the blade guard and the bearing housing 1. Remove the cutting head from the product. 5. Remove the screws. 2. Put the cutting head on a solid support. 3. Lock the belt pulley with a mandrel or a screwdriver. 6.
  • Page 59 6.14.2 To remove the blade shaft bearings • If you replace the bearings with a bearing press kit, use the Husqvarna bearing press kit, refer to The blade shaft bearings are pushed against a spacer Servicing tools overview on page 10 .
  • Page 60 10 . • If you replace the blade shaft bearings with a bearing press kit, use the Husqvarna bearing press Servicing tools overview on page 10 . kit, refer to 1. To assemble the blade shaft bearing with a hydraulic...

  • Page 61: Wet System

    6.15 Wet system 3. Use a plastic hammer and push the axle down until the spacer touches the inner stop in the bearing housing. 6.15.1 Function of the wet system Each side of the blade guard has a spray nozzle. The water hits a section of the cutting blade and the centrifugal force moves it out to the edge.

  • Page 62: Throttle Trigger And Throttle Lock

    3. Open the hose clip with a screwdriver. 3. Install new hose clips and close the hose clips with a pair of pliers. 4. Discard the hose clip. 6.16 Throttle trigger and throttle lock 6.15.3 To assemble the wet system 1.
  • Page 63 6. Remove the throttle trigger. To remove the 1. Remove the carburetor. Refer to carburetor on page 18 . 2. Push in the lower part of the throttle lock with a V- jaw adjustable pliers. 7. Push out the spindle to the right side. Use a rod with a diameter of 0.08–1.0 in./2–2.5 mm and approximately 4 in./10 mm in length.
  • Page 64 6.16.3 To assemble the throttle trigger and throttle 4. Install the right handle side. lock The spindles for the throttle trigger and the throttle control wheel must be installed from the right side. 1. Install the throttle trigger from the carburetor area (A).

  • Page 65: Troubleshooting

    7 Troubleshooting 7.1 Engine does not start Remove the spark plug from the cylinder. Hold the cylinder, pull the starter rope and see if there are sparks between the spark plug electrodes. There are no sparks at the spark plug Examine Cause Solution...

  • Page 66: Engine Stops During Operation - No Sparks

    7.2 Engine stops during operation - no sparks There are no sparks at the spark plug Symptom/Category Cause Solution Engine suddenly The switch is accidentally set to off Set the switch to the left position stops The plug cap is not attached Attach the plug cap fully The switch cable or high-voltage cable is Replace...

  • Page 67: Weak Output Or Change Of Speed

    7.4 Weak output or change of speed There are no sparks at the spark plug Symptom/Category Cause Solution Compression is good Air has gone through the fuel pipe joint. Make sure it is tight and there is no flame Air has gone into the fuel pipe because of a Replace crack or pin hole Air has gone through the pulse pipe...
  • Page 68 114216026 2019-11-12...

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