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Husqvarna 250 ps 250 ps chainsaw service repair manual
- 2. 2 Technical specification Engine Hydraulic transmission Ignition system Fuel/Oil system Weight Cutting attachment Cylinder volume Cylinder diameter Stroke Idle speed Max. recommended speed Hydraulic motor capacity Hydraulic pump capacity Working pressure, high pressure hose Pulse pressure, high pressure hose Pressure in return hose Flow Manufacturer/type of ignition system Spark plug Electrode gap Shaft length Weight Bar length Pitch Thickness of drive links Engine unit without cutting attachment Manufacturer/type of carburettor Fuel tank capacity litre Hydraulic oil tank capacity Method of chain lubrication 2-3-4-5-6 2,2-2,4-2,9-3,5-4,0 6/16 3/8 1,3 7,0 Walbro/HDA 86 0,9 1,3 Automatic Electrolux, ET Champion RCJ7Y 0,5 1,4 1,2 6-9 9 0,2-0,8 2-13 49 44 32 2 500 11 000 cm3 /rev cm3 /rev MPa MPa Mpa l/min mm liter liter m kg inch/cm inch mm cm3 mm mm rpm rpm kg
- 3. 3 Husqvarna 250 PS Chapter Page 1. Service data 4 2. Starter unit 12 3. Fuel system 14 4. Throttle lock 24 5. Ignition system 25 6. Clutch 28 7. Cylinder and piston 30 8. Crankcase and crankshaft 33 9. Hydraulics 38
- 4. 4 1. Service data Leak testing Crankcase, cylinder Remove the silencer, air filter and carburettor assembly. Use the carburettor bolts and spacers 502 50 45-01 to attach cover plate 502 50 72-01 to the inlet side of the cylinder. Attach cover plate 502 50 71-01 to the exhaust side of the cylinder. Use pressure tester 502 50 38-01. Pressure: 0.08 MPa (0.8 kp/cm2) Max. leakage: 0.02 MPa in 30 sec. (0.2 kp/cm2 in 30 sec.) Leak testing Carburettor Remove the carburettor from the pruning saw. Connect the hose of the pressure tester to the fuel hose nipple on the carburettor. Pressure: 0.03 MPa (0.3 kp/cm2, 4.3 psi) Leakage: no leakage is permitted. Tools: 502 50 38-01 Pressure tester Remember... ...never start the pruning saw if the hydraulic oil tank or hoses/shaft are not fitted. If the hydraulic oil tank is not fitted the clutch may come loose and cause injury. If the hoses or shaft are not fitted the engine cannot be revved up and the hydraulic pump and clutch may be damaged. ...the pressure relief valve in the hydraulic motor must open if there is a blockage in the return hose. If it opens without reason then it must be replaced. (See page 45.) ...you must be able to turn the pulley on the starter unit at least a further 1 1/2 turns when the starter cord is fully extended. ...do not use the pruning saw until it has been properly adjusted or repaired. ...the pruning saw is fitted with an electronic ignition system. This produces a powerful spark with a short burn time. If the performance of the pruning saw is poor, if the saw is difficult to start, or if it idles unevenly, first check the spark plug before taking any other action. ...the pruning saw consists of an engine unit and a hydraulic unit. It is often easier to handle the pruning saw when the hydraulic oil tank has been separated from the engine unit. (See page 38.)
- 5. 5 1 ! Fuel WARNING! The pruning saw is equipped with a two-stroke engine and should always be run on a mixture of petrol and two-stroke oil. To ensure the correct mixture always measure out the amount of oil that is needed accurately. If you mix small amounts of fuel small errors in the amount of oil will have a large effect on the mixture ratio. Always ensure good ventilation when mixing fuel. Petrol Use good quality unleaded or leaded fuel. The minimum recommended octane is 90. If the fuel is less than 90 octane it may cause knocking. This will lead to a higher engine temperature and may result in severe engine damage. Two-stroke oil For best results use Husqvarna two-stroke oil, which is specially developed for pruning saws. Mixture ratio: 1:50 (2%). If Husqvarna two-stroke oil is not available you may use another high quality two-stroke oil made for air-cooled engines. Mixture ratio: 1:33 (3%) - 1:25 (4%). Never use outboard oil, i.e. oil intended for water cooled outboard engines. Never use oil designed for four-stroke engines. Mixing Always mix petrol and oil in a clean container designed for petrol. Start by pouring half the petrol into the container. Then add all the oil. Shake the fuel mixture well. Now add the remaining petrol. Shake the fuel mixture thoroughly. Then pour the fuel into the fuel tank of the pruning saw. Never mix more fuel than you need for around 2 months work. If you do not intend to use the pruning saw for a long period the fuel tank should be drained and cleaned. The table on the left shows the various mixture ratios. 5 10 15 20 2%(1:50) 0,10 0,20 0,30 0,40 3%(1:33) 0,15 0,30 0,45 0,60 4%(1:25) 0,20 0,40 0,60 0,80 Gasolin Benzin Essence Gasolina Lit. Oil • Öl Huile • Aceite Lit. 1 2 1/2 5 2%(1:50) 2 1/2 6 1/2 12 7/8 3%(1:33) 3 3/4 9 3/4 19 1/4 4%(1:25) 5 1/8 12 7/8 25 3/4 US gallon US fl. oz.
- 6. 6 1 Tools 502 42 45-01 Test hose 502 42 50-01 Tool for pressure relief valve 502 50 26-01 Puller 502 50 30-12 Crankshaft fitting tool 502 50 33-01 Piston plug 502 50 38-01 Pressure tester assy. 502 52 13-01 502 52 14-01 Allen key with square socket 502 51 61-01 Tool for removing crankcase and crankshaft 502 50 46-01 Spacer 502 50 66-02 U key 502 50 71-01 Cover plate, exhaust 502 50 72-01 Cover plate, inlet 502 52 16-01 Locking tool for clutch drum 502 51 49-01 Key 502 51 54-01 Bolts for key 4 mm 6 mm
- 7. 7 1 Tools 3 mm 4 mm 5 mm 502 50 86-01 502 50 87-01 502 50 88-01 Allen screwdriver with ball 502 50 91-02 Touch-up paint, orange 502 51 91-01 Feeler gauge 502 51 34-02 Feeler gauge 502 50 79-01 Mandrel for sealing ring 502 50 06-01 Pliers, ignition cable 502 50 16-01 502 50 18-01 502 50 19-01 502 50 57-01 502 50 64-01 Allen key 8 mm 10 mm 502 50 22-01 502 50 23-01 Socket spanner 502 50 37-01 Vacuum tester 502 50 70-01 Assembly kit for cylinder assy. 502 50 83-01 Hook for tank 502 70 09-01 Pressure tester bulb 502 71 13-01 Test plug 502 71 14-01 Tachometer 6 mm 4 mm 3 mm 3/6" 5 mm 0,5 mm 0,3 mm 0,5 mm
- 8. 8 Cylinder cover Silencer Air filter, carburettor Fuel tank Bolt torques 1 38 Nm 39 Nm 40 Nm 29 Nm 42 Nm 28 Nm 27 Nm
- 9. 9 Cylinder, piston Starter unit Crankcase, crankshaft Flywheel, ignition module Bolt torques 1 37 Nm 25 Nm 26 Nm 36 Nm 35 Nm 33 Nm 34 Nm 32 Nm 32 Nm 41 Nm 23 Nm 24 Nm 22 Nm
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- 11. 10 Hydraulic oil tank Bolt torques 1 10 Nm 53 Nm 48 Nm 58 Nm 59 Nm 54 Nm 57 Nm 31 Nm 50 Nm 49 Nm 47 Nm 56 Nm 55 Nm 30 Nm 51 Nm 52 Nm
- 12. 11 Bar Sele Throttle handle Shaft, hydraulic hose 1 Bolt torques 4 Nm 5 Nm 2 Nm 7 Nm 3 Nm 8 Nm 21 Nm 19 Nm 17 Nm 18 Nm 20 Nm 12 Nm 15 Nm 16 Nm 45 Nm 44 Nm 46 Nm