T ECHNICAL INFORMATION Models No. Description NEW TOOL P 1 / 20 DCS230T/ PS-220TH DCS231T/ PS-221TH Engine Chain Saw 250mm W CONCEPT AND MAIN APPLICATIONS Primarily targeted at professionals who frequently prune fruit trees or street trees, these new models have been developed as "the lightest-in-the world*" top handle engine chain saws.
/ 20 [II] Disassembly/Assembly/Adjustment 1. Necessary Repairing Tools Tool No. Description Use for Disassembling/assembling kickback brake (inertia chain brake) system 1R003 Retaining Ring Pliers ST-2N 1R028 Bearing Setting Tool 20-12.2 1R034 Bearing Setting Plate 12.
/ 20 3. Disassembly/Assembly CAUTION: Be sure to remove gasoline and saw chain from the machine for safety before repair/ maintenance! Refer to the instruction manual for detailed information on how to remove or adjust saw chain. IMPORTANT: When replacing Oil pump, also replace chain oil by fresh one. 3-1. Clutch Section DISASSEMBLY 1) Clutch can be easily removed using Impact driver without locking Spindle. 2) Do not remove Spark plug because Clutch is removed using compression resistance.
/ 20 3-3. Oil Pump Section (cont.) ASSEMBLY 1) Fasten two M4x12 Pan head screws, first A then B so that Worm gear does not touch Oil pump. (Fig. 7) 2) Do not forget to set Flat washer 10 in place. (Fig. 7) 3) Install Oil pump cover and Worm gear, first Oil pump cover, then Worm gear. 4) After installation of Worm gear, make sure that Worm gear can be turned easily by hand. 3-4.
/ 20 3-5. Ignition System (cont.) Fig. 12 INSPECTION OF SPARK PLUG 1) Remove Plug cap, and remove Spark plug with supplied Wrench 13-16. Note: If Spark plug is wet with fuel, wipe it off with a clean cloth and dry Spark plug with power blower. 2) Remove carbon deposits on the center electrode and the ground electrode of Spark plug using wire brush. 3) Adjust the spark gap to 0.6-0.7mm by inserting a 0.7mm Spark plug gauge in the spark gap. (Fig.
/ 20 3-7. Inspection/Replacement of Stop Switch (cont.) 3) Using circuit tester, also check the conduction between the engine block and the terminal connector of the ground (earth) wire of Ignition coil complete. (Fig. 16) At the same time, check wrong wiring, loose screws, loose connections or broken wires. Fig. 16 Terminal connector of the ground (earth) wire of Ignition coil REPLACEMENT 1) Disconnect lead wires from Switch. Now Switch can be removed by pushing from the inside of Top handle cover.
/ 20 3-9. Replacement of Recoil Starter Rope Fig. 21 DISASSEMBLING 1) Remove Side handle, and separate Recoil starter assembly from the machine. 2) If Recoil starter rope is connected with both Starter knob and Reel, pull Starter knob to draw the rope out of Starter case and cut it. If the rope cannot be cut, pull Starter knob to draw out the rope till Reel rotates one turn. Then hook the rope on the U-shaped notch in Reel as illustrated in Fig.
/ 20 3-9. Replacement of Recoil Starter Rope (cont.) 4) Connect Reel with Spiral spring by Fig. 26 turning clockwise while tilting it [Start of connecting] as illustrated in Fig. 26. Take care not to Tilt down Reel so that this portion By rotating Reel clockwise about hook this portion can be hooked on Spiral spring. half a turn, Reel will move down on Spiral spring. to touch Spring case completely, indicating that it has been correctly connected with Spiral spring.
/ 20 3-9. Replacement of Recoil Starter Rope (cont.) If Spiral Spring Gets Out of Spring Case 1) Fix the straight end of Spiral spring in the small hole on Spring case as illustrated in Fig. 30. Then set Spiral spring in Spring case by winding up clockwise. (Fig. 31) 2) Spiral spring is factory-lubricated with red grease. However, you may use Makita grease N No. 2 when repairing. Apply a little amount. Fig. 30 Spiral spring small hole Spring case Fig. 31 3-10.
/ 20 3-10. Disassembling/Assembling Carburetor (cont.) DISASSEMBLING & CLEANING 1) Remove Diaphragm cover and Diaphragm gasket set by unscrewing four Pan head screws. Note: If Gasket is sticking, carefully remove it because it is easily broken. 2) Replace Metering diaphragm if it shows any sign of wear, wrinkles, curling or tears. 3) Controller set can be removed by unscrewing M3x4 (+) Screw. (Fig. 35) 4) Controller set includes Control lever, Inlet needle, Spring and Hinge pin.
/ 20 3-10. Disassembling/Assembling Carburetor (cont.) 7) Before removing two Pan head screws, tighten the idling screw on (A) to the full. (Fig. 38) 8) Before installing Strainer, ensure that it is not clogged with dust, dirt or debris. (Fig. 38) 9) Clean up the drainages in Carburetor first by spraying commercial carburetor cleaner and then, several minutes after, by washing with gasoline. Fig.
/ 20 3-13. Routing Tubes 1) Route Tubes as illustrated in Fig. 44. Fig. 44 2) Install Gasoline filter on the end of the fuel suction tube, which will be Primer placed in the fuel tank. pump Connect Tube 3-140 with the fuel suction tube using Tube joint. (Fig. 44) 3) On the top of Housing, route Tubes as illustrated in Fig. 45, 46. Tube 3-140 Tube joint Fuel suction tube Gasoline filter Top handle Fig. 45 Fig. 46 [Around the fuel tank] Place the two tubes parallel to one another.
/ 20 3-14. Removing/Disassembling/Assembling Engine Block (cont.) DISASSEMBLING Fig. 51 1) Separate Crank case from Cylinder by removing four M5x20 Hex socket head bolts. If cannot be separated because of the adhesive, remove by hitting the both ends of Crankshaft alternately with plastic or wooden hammer. Be careful not to let Crankshaft tilt too much at this time. Cylinder can be damaged. (Fig. 51) Now you can replace Oil seals on the ends of Crankshaft and two Piston rings on Piston.
/ 20 3-14. Removing/Disassembling/Assembling Engine Block (cont.) ASSEMBLING 1) Assemble Piston so that the triangular marking on Fig. 56 its top is placed on the exhaust muffler installation side (the longer Crankshaft side). (Fig. 56) triangular marking Crankshaft, longer 2) Piston ring is not reversible when assembled to Piston. Adjusting the end-gap of Piston ring fit in the groove of Piston; first the lower Piston ring, then the upper one. (Fig.
/ 20 3-15. Disassembling/Assembling Kickback Brake System DISASSEMBLING Fig. 60 Fig. 61 Chain slider (R) 1) Release Brake band (Hand guard cover) by pulling Front hand guard as illustrated in Fig. 60. 2) If Sprocket cover is assembled to the machine, separate by loosening Collared hex nut M8 with supplied Wrench 13-16. Front hand guard 3) Remove Spring cover and Chain slider (R) from Sprocket cover Fig. 61. 4) Grasp the rear end of Compression spring 9 Fig. 62 with Retaining ring pliers ST-2N (No.
/ 20 3-16. Miscellaneous Remarks [1] Do not reuse Gaskets between Exhaust muffler and Cylinder. Always use new one for replacement. (Fig. 66) Fig. 66 [2] If any sawdust or debris in the saw chain tensioner in Sprocket cover, blow it out using power blower or the like. (Fig. 67) Fig. 67 4. Adjustment See Instruction manual for adjustment of idling settings and saw chain tension.
P 17/ 20 Circuit diagram Color index of lead wires' sheath Black Red Receptacle Body earth Insulated connector Ignition coil complete Insulated receptacle Switch
P 18/ 20 Wiring diagram Connect the lead wires (red, black) with the terminals of switch before assembling the switch to the top handle cover. Switch Receptacle Top handle cover Lead wire (red) Lead wire (black) Assemble the switch to the top handle cover so that the rib on the top handle cover is positioned between the terminals of the switch. Switch Top handle cover Fix the lead wires with this lead wire holder.
P 19/ 20 Wiring diagram Route the lead wires through the space (the shaded portion) between the main housing and the top cover. Lead wires Top handle cover Main housing Top cover Lead wires Fix the lead wires with the lead wire holders. Route the lead wires under the tubes. Tubes Inside wall Pins Route the lead wires and the tubes between the pins and the inside wall. Fix the tubes with the lead wire holders.
P 20/ 20 Wiring diagram Route the lead wire through the space (the shaded portion) between the main housing and the baffle plate. Main housing Lead wire Baffle plate Route the lead wire between the pin and the inside wall. Inside wall Pin Fix the lead wire with the lead wire holder. Route the lead wire under the tubes. Tube Lead wire Ignition coil complete Assemble the insulated receptacle to the ignition coil complete as illustrated here.
