LawnMaster NPTGSP2517A Service Manual
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LawnMaster NPTGSP2517A Service Manual

25cc 2-cycle grass trimmer
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SERVICE MANUAL
25cc 2-Cycle Grass Trimmer
NPTGSP2517A
NPTGCP2517B
Read all safety rules and instructions carefully before servicing this tool.
601 Regent Park Court Greenville, SC 29607, 1-866-384-8432

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Summary of Contents for LawnMaster NPTGSP2517A

  • Page 1 SERVICE MANUAL 25cc 2-Cycle Grass Trimmer NPTGSP2517A NPTGCP2517B Read all safety rules and instructions carefully before servicing this tool. 601 Regent Park Court Greenville, SC 29607, 1-866-384-8432...

  • Page 2: Table Of Contents

    CONTENTS Section Page CONTENTS SPECIFICATIONS GENERAL SAFETY RULES PARTS AND FEATURES 6-12 WIRING DIAGRAM AND MANAGEMENT GENERAL TROUBLESHOOTING 14-24 AIR & FUEL SYSTEM 25-34 THROTTLE AND STARTER SYSTEM 35-39 NOPULL™ STARTER SYSTEM 40-43 25CC 2-CYCLE ENGINE GEAR HEAD AND SPOOL 45-49 MANUFACTURER'S WARRANTY AND CONTACT...

  • Page 3: Specifications

    SPECIFICATIONS UNIT SPECIFICATIONS Engine Engine Size 2-Stroke / Half Crank Engine Displacement Claimed / Rated 25cc / 25cm Ignition Capacitor Discharge Ignition (CDI) Fuel System Carburetor All Position Diaphragm Type With Primer Bulb Air Filter Foam (Dry) Engine Shut Off Auto-Reset Throttle Control Variable Speed Trigger...
  • Page 4 18-22 2-2.5 (Straight split shaft spanner. NPTGSP2517A) Tighten 1 hexalobular socket screw (M5X18) (with Connection cover thread glue) with 1 nut (M5) to secure the connection 27-31 3-3.5 assembly cover with a torque spanner.

  • Page 5: General Safety Rules

    GENERAL SAFETY RULES SAFETY To protect the eyes from loose objects that could be thrown from the trimmer, always wear eye protection with side shields marked to comply with ANSI Z87.1 when operating the trimmer. Use only genuine manufacturer’s replacement parts for this product. Failure to do so may cause poor fit, poor function and possible injury.

  • Page 6: Parts And Features

    PARTS AND FEATURES NPTGSP2517A EXPLODED VIEW...
  • Page 7 PARTS AND FEATURES NPTGSP2517A PARTS LIST Application Description Quantity Number 321007101 Cleva 25cc 2-Cycle Engine 321007102 Throttle-body & Starter Set 321007103 Throttle-body Set 321007104 Starter Set 2.2.1 321001105 Micro Switch 2.2.2 321007105 Starter Switch Assembly 2.2.3 321007106 Stop Switch Set 2.2.4...
  • Page 8 PARTS AND FEATURES NPTGCP2517B EXPLODED VIEW...
  • Page 9 PARTS AND FEATURES NPTGCP2517B PARTS LIST Application Description Quantity Number 321007101 Cleva 25cc 2-Cycle Engine 321007102 Throttle-body & Start Set 321007103 Throttle-body Set 321007104 Starter Set 2.2.1 321001105 Micro Switch 2.2.2 321007105 Starter Switch Assembly 2.2.3 321007106 Stop Switch Set 2.2.4 321007107 PCB Assembly...
  • Page 10 PARTS AND FEATURES EXPLODED VIEW 25CC 2-CYCLE ENGINE...
  • Page 11 PARTS AND FEATURES 25CC 2-CYCLE ENGINE PART LIST Application Description Quantity Number 321007120 Rear Engine Cover 321007121 Crankcase Cover 321007122 Washer 321007123 Gasket 321007124 Cylinder 321001139 Spark Plug 321007125 Ignition Coil Assembly 321007126 Conductor Plate 321007127 Insulation Sheet 321007128 Muffler 321007129 Muffler Cover 321007130...
  • Page 12 PARTS AND FEATURES 321007153 Piston 321007154 Piston Ring 321007155 Gasket 321007156 Carburetor Mount Assembly 321007157 Carburetor Washer 321007158 Carburetor (with one sheet) 321007159 Air Filter Base 321007160 Choke Lever 321007161 Air Filter 321007162 Air Filter Cover 321007163 Rubber Pad 321007164 Fuel Tank Assembly 46.1 321007165...

  • Page 13: Wiring Diagram And Management

    WIRING DIAGRAM AND MANAGEMENT - IGNITION AND STARTING Push-Start 2S Battery Pack Starter Switch (Self-reset) Panel Battery Connector VCC’ Battery Connector Battery Connector Bullet Terminal(BL) PCB ASSEMBLY Electric Motor Bullet Terminal(BL) Handle Engine Ignition Handle Stop Switch (Self-reset) 3.5 Bullet 3.5 Bullet Terminal 3.5 Bullet Terminal lgnition Coil...

  • Page 14: General Troubleshooting

    GENERAL TROUBLESHOOTING PROBLEM POSSIBLE CAUSE SOLUTION The electric motor does The battery is not fully Charge the battery fully and insert it not start, and the battery charged or not inserted correctly. indicator LED flashes red. correctly. The motor does not start, Allow the battery to cool to room and the battery indicator The battery is overheated.
  • Page 15 GENERAL TROUBLESHOOTING No fuel. Add fuel to the fuel tank. The fuel tube is blocked. Remove the blockage. The carburetor screws Tighten the carburetor screws or replace loosen and have air leakage. the carburetor washer. Clean or replace the spark plug. Reset the spark plug gap.
  • Page 16 GENERAL TROUBLESHOOTING Cylinder worn. Replace the cylinder. Piston and piston ring are Replace. worn out. Spark plug electrode is wet. Dry the spark plug. Spark plug has carbon Remove the carbon deposit. deposit. Spark plug insulation is Replace the spark plug. broken.
  • Page 17 GENERAL TROUBLESHOOTING Clutch is damaged. Replace. The clutch engages during The free length of the clutch Replace. idle speed. spring is too long. Clutch is off center. Replace. Incorrect carburetor Re-adjust the carburetor. adjustment. The carburetor has an air Replace or re-tighten. leakage.
  • Page 18 GENERAL TROUBLESHOOTING Engine Compression (See Figs. 1-2) Low compression will cause erratic idling, low power, and hard starting when hot. To test the engine compression: ■ Remove the spark plug cap. Fully cover the spark plug using the provided socket wrench. Rotate the wrench counter-clockwise to remove the spark plug (Fig.
  • Page 19 GENERAL TROUBLESHOOTING ■ Press the start button to check if the spark plug sparks. If not, check the gap between the rotor and the ignition coil following below steps. ■ Rotate the socket wrench counter-clockwise to remove the 5 screws on the rear engine cover. Then remove the rear engine cover (Fig.
  • Page 20 GENERAL TROUBLESHOOTING ■ Remove the gasket (Fig. 11). Insert the sharp-nose plier into the slots of the clutch and rotate it counter-clockwise to remove the clutch, and then remove the clutch washer (Fig. 11 & 13). Clutch Gasket Slots Fig. 11 Fig.
  • Page 21 GENERAL TROUBLESHOOTING Front Engine Terminals of Stop Cover Assembly Switch Cables Fig. 16 ■ Make sure the gap is between 0.012 and 0.015 in. (0.30-0.40 mm) as instructed in step 3 of the Ignition Coil Replacement section (Fig. 17). Feeler Gauge Fig.
  • Page 22 GENERAL TROUBLESHOOTING Spark Plug Cover Ignition Coil Fig. 18 Fig. 19 Ignition Coil ■ To adjust the gap between the flywheel and the ignition coil, first insert a feeler gauge of 0.014 in. (0.35mm) between the flywheel and the ignition coil, then rotate the flywheel and align the magnetic pole of the flywheel with the ignition coil.
  • Page 23 GENERAL TROUBLESHOOTING Flywheel (Rotor) Replacement (See Figs. 21-25) ■ Remove the rear engine cover, connection cover and front engine cover referring to steps 5 – 9 in Ignition System section. ■ Remove the flywheel cover assembly and washer (Fig. 21). Flywheel Cover Assembly Washer...
  • Page 24 GENERAL TROUBLESHOOTING ■ Check the flywheel is in good condition and installed into place. Examine it for signs of damage. Check if the rotor magnets meet the requirements. Check that the fins are in good condition. Replace with a new flywheel if necessary. ■...

  • Page 25: Air & Fuel System

    AIR & FUEL SYSTEM Air Filter Replacement (See Figs. 26-29) ■ Loosen the screw to remove the air filter cover (Fig. 26). ■ Remove the air filter from the air filter cover (Fig. 27). Air Filter Cover Air Filter Air Filter Cover Fig.
  • Page 26 AIR & FUEL SYSTEM L Screw L Screw T Screw H Screw Fig. 30 Fig. 31 The requirements of carburetor flow rate: ■ With the flowmeter: The idle speed flow rate is 0.26-0.28 lbs./h (0.12-0.13 kg/h). The high-speed flow rate is 0.88-0.97 lbs./h (0.40-0.44 kg/h). ■...
  • Page 27 AIR & FUEL SYSTEM Max speed NPTGSP2517A (straight shaft) About 7900-8700RPM NPTGCP2517B (curved split About 7400-7700RPM shaft) Fig. 33 Fig. 34 ■ Remove the carburetor adjustment tool and re-check the max no load speed. Engage and release the throttle trigger quickly to operate the trimmer at full throttle, and observe the RPM displayed on the tachometer.
  • Page 28 AIR & FUEL SYSTEM ■ Remove the carburetor adjustment tool and re-check the idle speed and the max no load speed again. Make sure they are correct (Fig. 36). Fig. 36 General Fuel Systems Operations (See Figs. 37-49) Carburetor Replacement ■...
  • Page 29 AIR & FUEL SYSTEM ■ Unplug the fuel tubes with hands or pliers. PAY ATTENTION NOT to damage the tube for fuel entering. The black tube is for fuel entering. The transparent is for fuel return (Fig. 40). Fuel Tube (Black) Fuel Return Tube Carburetor (Transparent)
  • Page 30 AIR & FUEL SYSTEM Threaded Holes Negative Pressure Hole Fig. 44 Gasket ■ Replace with a new carburetor mount and gasket. Make sure to align the holes on the gasket with the 2 threaded holes and the negative pressure hole on the cylinder (Fig. 44). NOTE: Make sure a new carburetor mount and gasket are replaced in the exact order in which they were removed.
  • Page 31 AIR & FUEL SYSTEM Fig. 48 ■ Remove and replace with a new fuel tank. NOTE: Make sure all parts are replaced in the exact order in which they were removed. Insert the Fuel Tube Connect the fuel tubes with the carburetor. The black tube is for fuel entering. The transparent is for fuel return.
  • Page 32 AIR & FUEL SYSTEM ■ Appropriate protective equipment is required when removing the muffler (Fig. 51). Fig. 51 ■ The cylinder fins and housings should be checked periodically and cleaned to help prevent the engine from overheating. Check the cylinder exhaust, piston, and piston ring for carbon build up. NOTE: Do not allow the carbon deposit to fall into the cylinder when removing the buildup (Fig.
  • Page 33 AIR & FUEL SYSTEM ■ Remove the dust filter (Fig. 55). Fig. 55 ■ Remove the gear assembly with volute spring and ratchet wheel, and replace each of them if needed (Fig. 56). Ratchet Wheel Volute Spring Fig. 56 ■ Remove the dual gear, dual gear shaft, and gaskets and replace if needed (Fig. 57). Dual Gear Dual Gear Shaft Gaskets...
  • Page 34 AIR & FUEL SYSTEM ■ Turn the Phillips screwdriver counter-clockwise to remove the 2 screws on the electric start motor (Fig. 58). Fig. 58 ■ Remove the electric start motor. Open the corrugated pipe and separate the stop switch cables and motor drive lines, then remove and replace the electric start motor if needed (Fig.

  • Page 35: Throttle And Starter System

    THROTTLE AND STARTER SYSTEM Disassembly, Inspection & Repair of Throttle and Starter System (See Figs. 60-79) ■ Remove the 9 screws on the main handle (8 screws on the right cover and 1 screw on the left cover). Then remove the right cover of the main handle (Fig. 60 & 61). Fig.
  • Page 36 THROTTLE AND STARTER SYSTEM ■ Check the PCB assembly, microswitch, throttle safety and throttle lever. Replace if required (Fig. 64). Throttle Safety Microswitch Assembly Throttle Lever Fig. 64 ■ Use a proper tool (e.g. a screwdriver) to pry off the microswitch. ■...
  • Page 37 THROTTLE AND STARTER SYSTEM ■ Restore the microswitch into place (Fig. 69). Fig. 69 ■ Connect the LED light cable to the electric starter cover plate. Always pull gently after assembly to ensure that terminals of the LED cable are connected in place (Fig. 70). Fig.
  • Page 38 THROTTLE AND STARTER SYSTEM ■ Turn over the handle cover and re-install 1 screw (Fig. 73). Fig. 73 ■ To install the torsional spring and throttle safety, first pay attention to the correct direction of the torsional spring with the long end upwards as shown (Fig. 74). Make sure the throttle safety and the torsional spring are installed into place (Fig.
  • Page 39 THROTTLE AND STARTER SYSTEM ■ Wrap the wiring harness of the engine with the opened corrugated pipe. One end of the wiring harness is exposed and another end of the power lines should be straightened out and thrust into the engine cover. ■...

  • Page 40: Nopull™ Starter System

    NOPULL STARTER SYSTEM Special troubleshooting instructions for No-Pull™ Start Button (See Figs. 80-87) Starting Operation Lift the start button cover and press the start button to start the electric motor. Release the start button to stop the electric motor (Fig. 80). NOTE: When the start button remains pressed, the electric motor will run for about 5 seconds then it will stop automatically.
  • Page 41 NOPULL STARTER SYSTEM B. Red flashing of the battery indicator LED indicates that battery voltage is too low and needs to be charged. C. Green flashing of the battery indicator LED indicates that a short circuit occurs in the electric starter. Check the electric motor and the motor drive lines as below: Open the corrugated pipe and disconnect the male and female terminals of the motor drive lines (blue) (Fig.
  • Page 42 NOPULL STARTER SYSTEM F. If the battery indicator LED does not turn on, the possible causes are as below: 1). The microswitch is broken. Replace it. 2). The wiring harness of the microswitch has detached. Re-weld it. 3). There is failed contact in the battery connector to the PCB. Adjust the battery connector (Fig. 84).
  • Page 43 NOPULL STARTER SYSTEM male and female terminals in the corrugated pipe buckle; 3). The stop switch has broken. Fig. 86 B. Test the stop switch wiring harness of the engine (Fig. 87). If conduction fails, the possible causes are: 1). An open circuit in the connection position between the wiring harness of the engine and the ignition coil;...

  • Page 44: 25Cc 2-Cycle Engine

    25CC 2-CYCLE ENGINE Internal Engine Disassembly Inspection & Repair Engine Start Requirements and Inspection ■ Ignition System: Require a strong spark in the best ignition time. Inspection sequence (from exit to entrance): spark plug → spark plug cap → starter switch → high voltage line, ground line and on-off switch line →...

  • Page 45: Gear Head And Spool

    After every 25 hours of use, check the level of grease (XHP 223) inside the gear box and outside the axle. Add approximately 0.01 lbs. (5 g) of grease (XHP 223) if necessary (Fig. 88). The gear head of the straight shaft grass trimmer (NPTGSP2517A) has a left hand rotation. The screw thread specification is M10×1.25-LH.
  • Page 46 Fig. 91 Spool Replacement (See Figs. 92-99) Straight shaft grass trimmer (NPTGSP2517A) ■ Hold the main spool cover. Using the index finger and thumb firmly squeeze the locking tabs on the trimmer head housing. Then remove the spool cover together with the spool (Fig. 92).
  • Page 47 GEAR HEAD AND SPOOL Curved split shaft grass trimmer (NPTGCP2517B) ■ Hold the main spool cover, and turn the spool head counter-clockwise to remove. Then remove the main spool cover together with the spool from the grass trimmer (Fig. 96). ■...
  • Page 48 GEAR HEAD AND SPOOL Line Replacement (See Figs. 100-105) Straight shaft grass trimmer (NPTGSP2517A) ■ Remove the empty spool from the grass trimmer referring to the Spool Replacement section. ■ Remove any remaining cutting line from the spool. NOTE: Use only round monofilament line with the recommended diameter.
  • Page 49 GEAR HEAD AND SPOOL Fig. 103 ■ Hook the folded end of the cutting line onto either of the slots in the spool (Fig. 104). ■ Wind the line onto the spool. Wind the line in the “Wind Cord” arrow direction indicated on the spool (Fig.

  • Page 50: Manufacturer's Warranty And Contact

    No-Pull LIMITED WARRANTY We take pride in producing a high quality, durable product. This LawnMaster® product carries a limited two (2) year warranty against defects in workmanship and materials from date of purchase under normal household use. This product carries a ninety (90) day warranty from the date of purchase when used for commercial or rental purposes.

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