LawnMaster NPTGSP2517A User manual

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

2
Section Page
CONTENTS
CONTENTS 2
SPECIFICATIONS 3-4
GENERAL SAFETY RULES 5
PARTS AND FEATURES 6-12
WIRING DIAGRAM AND MANAGEMENT 13
GENERAL TROUBLESHOOTING 14-24
AIR & FUEL SYSTEM 25-34
THROTTLE AND STARTER SYSTEM 35-39
NOPULL™ STARTER SYSTEM 40-43
25CC 2-CYCLE ENGINE 44
GEAR HEAD AND SPOOL 45-49
MANUFACTURER'S WARRANTY AND CONTACT 50

3
SPECIFICATIONS
TORQUE SPECIFICATIONS
Engine Size 2-Stroke / Half Crank
Engine Displacement Claimed / Rated 25cc / 25cm3
Ignition Capacitor Discharge Ignition (CDI)
Carburetor All Position Diaphragm Type With Primer Bulb
Air Filter Foam (Dry)
Engine Shut Off Auto-Reset
Throttle Control Variable Speed Trigger
Fuel / Oil Ratio 40 : 1
Fuel Tank Capacity 420 ml
Spark Plug Champion RCJ6Y
Rotor Air Gap 0.012”-0.015” (0.30-0.40 mm)
Spark Plug Gap 0.026” (0.65 mm)
Run Time on Full Tank 50 Minutes
UNIT SPECIFICATIONS
Engine
Fuel System
General
Application Description Torque Torque
(IN.LBS) (N.m)
Cylinder to crankcase Use 3 hexalobular socket screws (M6X20) (with thread
glue) to secure the cylinder to crankcase. 71-80 8-9
Crankcase rear cover
to crankcase
Use 4 hexalobular socket screws (M5X18) (with thread
glue) to secure the crankcase rear cover to crankcase. 27-35 3-4
Spark plug to cylinder Pre-screw the spark plug to cylinder, and then tighten
with a torque spanner. 106-124 12-14
Mufer to cylinder
Put the 2 hexalobular socket screws (M5X56) through
the mufer assembly. Apply a thermostable screw-
thread glue onto the 2 screw holes and secure the
mufer to the cylinder using the torque spanner.
62-71 7-8
Carburetor mount to
cylinder
Use 2 hexalobular socket screws (M5X30) (with thread
glue) to secure the carburetor mount to cylinder. 35-44 4-5

4
SPECIFICATIONS
Ignition coil to cylinder
Use 2 hexalobular socket screws (M5X23) (with thread
glue) to secure the ignition coil to cylinder. One of the
screws should pass through the conductor plate rst,
and then through the ignition coil assembly.
44-53 5-6
Front engine cover to
crankcase
Use 4 hexalobular socket screws (M5X23) (with thread
glue) to secure the front engine cover to crankcase. 27-35 3-4
Clutch to crankshaft
Apply a thermostable screw-thread glue onto the
clutch threaded hole. Secure the clutch to the
crankshaft with a torque spanner.
106-133 12-15
Front engine cover to
rear engine cover
Tighten the 5 self-tapping screws (ST4.8X16F) to
secure the front engine cover and rear engine cover. 18-22 2-2.5
Connection cover to
front engine cover
Tighten the 4 self-tapping screws (ST4.8X16F) to
secure the connection cover and front engine cover. 18-22 2-2.5
Air lter base to
carburetor mount
assembly
Make 2 hexalobular socket screws (M5X55) pass
through the casing pipe, air lter base, carburetor and
carburetor washer, then secure them to the carburetor
mount assembly using the torque spanner.
31-40 3.5-4.5
Electric start motor to
front engine cover
Apply a thermostable screw-thread glue onto the 2
cross machine screws (M3X8). Secure the electric
start motor to the front engine cover with a torque
spanner.
4-5 0.5-0.6
Upper engine cover to
front engine cover
Make 4 self-tapping screws (ST3.9X16F) pass through
the upper engine cover and dust lter, then secure the
upper engine cover to the front engine cover with a
torque spanner.
9-13 1-1.5
LED light panel to
starter switch base
Tighten 1 self-tapping screw (ST2.2X6F) to secure the
LED light panel to starter switch base with a torque
spanner.
2-4 0.2-0.5
Starter switch pressing
plate to start button
Tighten 1 self-tapping screw (ST3.9X16F) to secure
the starter switch pressing plate and the start button
with a torque spanner.
9-13 1-1.5
Throttle-body assembly Tighten 7 self-tapping screws (ST3.9X16F) to secure
the throttle-body with a torque spanner. 9-13 1-1.5
Main handle to
connection cover
(Curved split shaft
NPTGCP2517B)
Tighten 1 self-tapping screw (ST4.8X16C) to secure
the main handle to connection cover with a torque
spanner.
18-22 2-2.5
Main handle to
connection cover
(Straight split shaft
NPTGSP2517A)
Tighten 1 cross tapping screw (ST4.8X16F) to secure
the main handle to connection cover with a torque
spanner.
18-22 2-2.5
Connection cover
assembly
Tighten 1 hexalobular socket screw (M5X18) (with
thread glue) with 1 nut (M5) to secure the connection
cover with a torque spanner.
27-31 3-3.5
Throttle-body to
aluminum upper shaft
Tighten 2 cross countersunk-head screws (ST5X10) to
secure the throttle-body to aluminum upper shaft with
a torque spanner.
13-18 1.5-2

5
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
t, poor function and possible injury.
Scarfs, neckties, jewelry, jackets or other loose clothing and accessories should be avoided as they
can be caught on or become entangled in the trimmer. Secure hair so it is above shoulder level. To
protect your legs and feet, long pants and closed toed shoes should be worn.
To improve your grip and protect your hands, wear heavy-duty nonslip gloves.
The sound level exceeds 85 dB(A). To prevent hearing damage, always wear sound barriers (ear plugs
or ear mufers).
GENERAL TRIMMER SAFETY
Never operate the trimmer with a damaged guard or without the guard in place.
Avoid getting into direct contact with the line.
Always remember to keep both hands on the control handles when the engine is running.
Do not operate the trimmer if there is a fuel leak as it is a re hazard. The fuel leak must be xed prior
to operating the trimmer.
Empty the fuel tank before storing if the trimmer will not be used for a few days.
Make sure the control handles have not accumulated oil and fuel and are clean and dry.
See Operator’s Manual for additional safety precautions.
WORK AREA
Operate only in well ventilated areas.
Observe all safety regulations for the safe handling of fuel. Mix and handle fuel in a container approved
for storing gasoline. Wipe the trimmer dry if fuel is spilled on it. Always move away from the fueling
area before starting the engine.
Fuel the trimmer at least 10 ft. (3 m) from the place where you start the engine and operate the
trimmer.
NOTE: The trimmer head will rotate during carburetor adjustment. Wear protective equipment and
observe all safety instructions.

6
PARTS AND FEATURES
NPTGSP2517A EXPLODED VIEW

7
PARTS AND FEATURES
NPTGSP2517A PARTS LIST
Key
Number Application Description Quantity
1 321007101 Cleva 25cc 2-Cycle Engine 1
2 321007102 Throttle-body & Starter Set 1
2.1 321007103 Throttle-body Set 1
2.2 321007104 Starter Set 1
2.2.1 321001105 Micro Switch 1
2.2.2 321007105 Starter Switch Assembly 1
2.2.3 321007106 Stop Switch Set 1
2.2.4 321007107 PCB Assembly 1
3 321008101 Connection Cover Assembly 1
4 321008102 Aluminum Upper Shaft 1
5 141004102 Cable Clamp 2
6 321001109 Handle Spacer 2
7 321008103 Assist Handle Assembly 1
8 321008104 Aluminum Connector Assembly 1
9 321008105 Aluminum Lower Shaft 1
10 321008106 Debris Guard 1
10.1 321008107 Small Debris Guard Assembly 1
10.2 321008108 Large Debris Guard Assembly 1
11 321008109 Spool Head Assembly 1
11.1 321008110 Spool Spring 1
12 321008111 Gear Box 1
12.1 321008112 Screw M5*16 3
12.2 321008113 Cover Plate 1
13 321007116 7.2V 1.3Ah Lithium-Ion Battery 1
14 321001127 Charger 1
15 321001128 Shoulder Strap Clasp (Available Separately) 1
16 221003102 Shoulder Strap (Available Separately) 1
17 321004122 M5 Hexagon Socket Wrench 1
18 321004121 M6 Hexagon Socket Wrench 1
19 321007118 Quincunx Wrench 1
20 321007119 Socket Wrench 1

8
PARTS AND FEATURES
NPTGCP2517B EXPLODED VIEW

9
PARTS AND FEATURES
NPTGCP2517B PARTS LIST
Key
Number Application Description Quantity
1 321007101 Cleva 25cc 2-Cycle Engine 1
2 321007102 Throttle-body & Start Set 1
2.1 321007103 Throttle-body Set 1
2.2 321007104 Starter Set 1
2.2.1 321001105 Micro Switch 1
2.2.2 321007105 Starter Switch Assembly 1
2.2.3 321007106 Stop Switch Set 1
2.2.4 321007107 PCB Assembly 1
3 321007108 Connection Cover Assembly 1
4 321007109 Aluminum Upper Shaft 1
4.1 321007110 Shaft Connection Sleeve 1
5 141004102 Cable Clamp 2
6 321007111 Handle Spacer 2
7 321007112 Assist Handle 1
8 321007113 Lower Curved Shaft 1
9 321007114 Spool Head Assembly 1
9.1 321007115 Spool Spring 1
10 321002105 Debris Guard 1
11 321007116 7.2V 1.3Ah Lithium-Ion Battery 1
12 321001127 Charger 1
13 321004122 M5 Hexagon Socket Wrench 1
14 321007118 Quincunx Wrench 1
15 321007119 Socket Wrench 1

10
PARTS AND FEATURES
EXPLODED VIEW 25CC 2-CYCLE ENGINE

11
PARTS AND FEATURES
25CC 2-CYCLE ENGINE PART LIST
Key
Number Application Description Quantity
1 321007120 Rear Engine Cover 1
2 321007121 Crankcase Cover 1
3 321007122 Washer 1
4 321007123 Gasket 1
5 321007124 Cylinder 1
6 321001139 Spark Plug 1
7 321007125 Ignition Coil Assembly 1
8 321007126 Conductor Plate 1
9 321007127 Insulation Sheet 1
10 321007128 Mufer 1
11 321007129 Mufer Cover 1
12 321007130 Gasket 1
13 321007131 Cables 2
14 321007132 Clutch 1
15 321007133 Clutch Cover Assembly 1
16 321007134 Connection Cover 1
17 321007135 Electric Start Motor 1
18 321007136 Front Engine Cover 1
19 321007137 Gear 1
20 321007138 Volute Spring 1
21 321007139 Ratchet Wheel 1
22 321007140 Dust Filter 1
23 321007141 Upper Engine Cover 1
24 321007142 Dual Gear Shaft 1
25 321007143 Dual Gear 1
26 321007144 Corrugated Pipe 1
27 321007145 Cables 1
28 321007146 Cables 1
29 321007147 Flywheel Cover Assembly 1
30 321007148 Flywheel 1
31 321007149 Crankcase Assembly 1
32 321007150 Connection Shaft 1
33 321007151 Retainer Ring 2
34 321007152 Piston Pin 1

12
PARTS AND FEATURES
35 321007153 Piston 1
36 321007154 Piston Ring 1
37 321007155 Gasket 1
38 321007156 Carburetor Mount Assembly 1
39 321007157 Carburetor Washer 1
40 321007158 Carburetor (with one sheet) 1
41 321007159 Air Filter Base 1
42 321007160 Choke Lever 1
43 321007161 Air Filter 1
44 321007162 Air Filter Cover 1
45 321007163 Rubber Pad 4
46 321007164 Fuel Tank Assembly 1
46.1 321007165 Protective Film 1
47 321007166 Fuel Tube 1
48 321007167 Fuel Cap 1
49 321007168 Clutch Washer 1
50 321007169 Gasket 1
51 321007170 Washer 1
52 321007171 Gasket 2
53 321007172 Washer 1
54 321007173 Tower Spring 1
55 321007197 Screw 2
56 321007183 Screw 1
57 321007176 Washer 1
58 301002177 Self-Tapping Screw 9
59 321007177 Screw Assembly 5
60 321007178 Screw Assembly 3
61 321007179 Screw Assembly 6
62 321007180 Screw Assembly 2
63 131017110 Self-Tapping Screw 4
64 321007181 Screw 2
65 321001131 Nut 1
66 321007182 Bolt 2

13
WIRING DIAGRAM AND MANAGEMENT
- IGNITION AND STARTING
Push-Start
BK
BK
BK
BK
Handle
Engine
Engine Body
滚滚长江东逝水
滚滚长江东逝水
Engine Body
Ignition
Stop Switch (Self-reset)
3.5 Bullet
3.5 Bullet Terminal
lgnition Coil
Spark Plug
3.5 Bullet Terminal
2S Battery Pack Starter Switch (Self-reset)
NTC
NTC
RD
RD
BK BK
RD
Bullet Terminal(BL)
Bullet Terminal(BL)
Electric
Motor
EngineHandle
M
RD
J10 J9
J8
GND M+
M-
Battery
Connector
LED
Panel
Battery Connector
PCB ASSEMBLY
VCC’
Battery Connector

14
GENERAL TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
The electric motor does
not start, and the battery
indicator LED ashes red.
The battery is not fully
charged or not inserted
correctly.
Charge the battery fully and insert it
correctly.
The motor does not start,
and the battery indicator
LED ashes yellow.
The battery is overheated.
Allow the battery to cool to room
temperature. Re-start the machine after
about 30 minutes.
The motor does not start,
and the battery indicator
LED ashes green.
Possible short circuit in the
electric motor or the motor
drive lines.
Check if there is a short circuit in the
electric motor or the motor drive lines
referring to page 41.
The motor does not start,
and the battery indicator
LED ashes red and green
alternatively.
The starting current is
excessive. The engine or
electric motor may be seized
or cannot rotate smoothly.
Check if the engine or the electric motor is
stuck and cannot rotate smoothly referring
to page 41.
The motor does not start,
and the battery indicator
LED is continuously on.
There is an open circuit from
the PCB output to the motor
connecting line.
Check if there is an open circuit occurs
from the PCB output to the motor
connecting line referring to page 41.
The electric motor starts,
but the engine does not
start.
The starter drive system is
broken.
Remove the electric starter. Replace the
drive system.
If drive system of the starter is in good
condition, the engine may be broken.
The engine does not start.
No spark or weak spark.
Clean or replace the spark plug. Reset the
spark plug gap 0.026”±0.002” (0.65±0.05
mm).
Check the gap between ignition coil and
ywheel. Make sure the gap is 0.012’’-
0.015’’ (0.30-0.40mm).
The air lter is blocked. Clean the air lter.
The fuel tank valve is
blocked. Remove the blockage or replace.
Incorrect lubricant/fuel. Use correct lubricant/fuel.
The fuel tube is blocked or
broken. Clean or replace.
Incorrect carburetor
adjustment. Re-adjust the carburetor.
The carburetor is blocked. Remove the blockage.
Excessive oil in carburetor. Tighten the carburetor nut or replace the
carburetor washer.

15
GENERAL TROUBLESHOOTING
The engine stops during
operation.
No fuel. Add fuel to the fuel tank.
The fuel tube is blocked. Remove the blockage.
The carburetor screws
loosen and have air leakage.
Tighten the carburetor screws or replace
the carburetor washer.
No spark or weak spark.
Clean or replace the spark plug. Reset the
spark plug gap.
Check the gap between ignition coil and
ywheel. Make sure the gap is 0.012’’-
0.015’’ (0.30-0.40mm).
Abnormal engine
compression.
Check if the piston ring sinters and the
piston and piston ring wear status. Check
the carbon deposit status in combustor.
Check the wear status inside cylinder.
Check if the spark plug loosens.
Check the gap between ignition coil and
ywheel. Make sure the gap is 0.012’’-
0.015’’ (0.30-0.40mm).
The engine is ooded.
Remove the spark plug. Clip the fuel tube
for fuel entering. Press the start button to
remove the fuel inside the cylinder.
The engine has less
power.
The choke lever is closed. Open the choke lever.
The air lter is blocked. Clean the air lter.
The fuel lter is blocked. Remove the blockage or replace.
Incorrect lubricant/fuel. Use correct lubricant/fuel.
Incorrect carburetor
adjustment. Re-adjust the carburetor.
Carburetor washer hardens. Replace.
The main nozzle of the
carburetor is blocked.
Clean or replace the carburetor if
necessary.
The spark plug is worn out. Check or replace.
The carburetor has air
leakage. Tighten the carburetor.
The fuel has been
contaminated with water. Empty tank and replace with clean fuel.
Mufer has carbon deposit. Remove the carbon deposit.
Exhaust port has carbon
deposit. Remove the carbon deposit.
Piston ring sinters. Clean the ring groove or replace the
piston ring.

16
GENERAL TROUBLESHOOTING
Cylinder worn. Replace the cylinder.
Piston and piston ring are
worn out. Replace.
No spark.
Spark plug electrode is wet. Dry the spark plug.
Spark plug has carbon
deposit. Remove the carbon deposit.
Spark plug insulation is
broken. Replace the spark plug.
Spark plug gap is too big/
small. Adjust to 0.026”±0.002” (0.65±0.05 mm).
Spark plug electrode is burnt
out. Replace the spark plug.
High voltage line of the
ignition coil is broken. Replace the high voltage line.
Ignition coil is broken or
burnt out. Replace the ignition coil.
Poor contact of the high
voltage line and the jump
ring.
Repair.
Spark plug cap is broken. Replace.
Engine will not start but
spark plug res.
Excess fuel inside spark
plug.
Remove the spark plug. Clip the fuel tube
for fuel entering. Press the start button to
remove the fuel inside the cylinder.
Fuel is not clean, with water. Replace the fuel.
Cylinder and piston ring
wear. Replace.
The spark plug loosens. Tighten.
Crankcase has air leakage. Replace the gasket.
Cylinder has air leakage. Replace the gasket.
No fuel. Add fuel.
No fuel in primer bulb. Prime the bulb.
Engine is not choked. Engage the choke.
Fuel tank valve is blocked. Remove the blockage.
The engine cannot be
stopped.
The switch wire does not
connect. Connect the wire.
The switch is broken. Replace.

17
GENERAL TROUBLESHOOTING
The clutch engages during
idle speed.
Clutch is damaged. Replace.
The free length of the clutch
spring is too long. Replace.
Clutch is off center. Replace.
No load speed is not
stable/consistent.
Incorrect carburetor
adjustment. Re-adjust the carburetor.
The carburetor has an air
leakage. Replace or re-tighten.
Fuel tube is broken. Replace.
Crankcase washer has air
leakage. Replace.
Fuel seal has air leakage. Replace.
After releasing the throttle
lever, the trimmer head
continues to rotate.
Idle speed is too high. Adjust the engine.
Clutch spring is broken. Replace.
Clutch friction plate is
broken. Replace.
The engine accelerates,
but the trimmer head does
not rotate.
The axle rotating spline or
the square hole of pawl
assembly is worn out.
Replace.
Irregular vibration.
The trimmer head is not
balanced. Repair or replace.
The drive shaft is bent. Replace.
Worn bearings. Replace.
Clutch is off center. Replace.

18
GENERAL TROUBLESHOOTING
Ignition System (See Figs. 3-17)
■ 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.
■ Check and remove the carbon deposit in the spark plug. The spark plug gap should be 0.026”±0.002”
(0.65±0.05mm). Inspect the electrodes for wear and deposits (Fig. 3).
■ Install the spark plug into the spark plug cap. Contact the negative electrode to the aluminum part
(Fig. 4 & 5).
0
30
60
90
120 150 180
210
240
270
300
Fig. 2Fig. 1
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. 1).
■ Rotate a compression gauge into the spark plug hole (Fig. 2). Insert the battery pack into the battery
slot. Lift the start button cover and press the start button. Test the engine compression. Engine
compression should be >0.6MPa.
Fig. 4Fig. 3
Outer Electrode
0.026 in. (0.65 mm)
Fig. 5

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. 6).
■ Rotate the socket wrench counter-clockwise to remove the 4 screws on the connection cover. Then
remove the connection cover (Fig. 7).
■ Use the socket wrench to hold against the ywheel from the back side as shown (Fig. 8). Rotate the
quincunx wrench counter-clockwise to remove the clutch cover assembly (Fig. 9 & 10).
Fig. 9Fig. 8
Fig. 7Fig. 6
Fig. 10
51
2
3
4
1
2
3
4
Clutch Cover Assembly
Clutch Cover Assembly
Rear Engine
Cover
Connection Cover

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).
Fig. 12Fig. 11
■ Rotate the quincunx wrench counter-clockwise to remove the 4 screws on the front engine cover
(Fig. 14). Release the stop switch cables from the notch as shown in Fig. 15. Then carefully remove
the front engine cover assembly to show the ywheel and the ignition coil, and disconnect the
terminals of stop switch cables from the ignition coil. Remove the front engine cover assembly
(Fig. 15 & 16).
Fig. 13
Fig. 15Fig. 14
Gasket
Clutch
Slots
Clutch Washer
Clutch
1
2
3
4
Stop Switch
Cables
Front Engine Cover Assembly