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[ NEW FEATURES ]

Small OHV Four

-

stroke Engine

Lightest weight in its Class

Smallest engine in its Class

PRODUCT NAME

Hitachi Engine Grass Trimmer

Models

    CG 25EUS (L)

CG 25EUS

     

The newly released CG 25EUS Engine Grass Trimmer is Hitachi Koki group first tool equipped with a small four-
cycle engine. There is now a growing need for tools equipped with a small, low-exhaust four-cycle engine as
environmentally friendly products.
With the new Model CG 25EUS, we aim to enhance the market share of Hitachi’s engine grass trimmer series.

LIST Nos.
CG 25EUS

 

: E071

May. 2010

Cutting grass:

 Cutting grass in fields

 Cutting undergrowth in orchards

 Cutting other general kinds of grass

MARKETING OBJECTIVE

APPLICATIONS

SELLING POINTS

Sales Division

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

C

CG 25EUS (L)

Summary of Contents for CG 25EUS L

Page 1: ...s now a growing need for tools equipped with a small low exhaust four cycle engine as environmentally friendly products With the new Model CG 25EUS we aim to enhance the market share of Hitachi s engine grass trimmer series LIST Nos CG 25EUS E071 May 2010 Cutting grass Cutting grass in fields Cutting undergrowth in orchards Cutting other general kinds of grass MARKETING OBJECTIVE APPLICATIONS SELL...

Page 2: ...i com manual_view_export Throughout this TECHNICAL DATA AND SERVICE MANUAL a symbol s is are used in the place of company name s and model name s of our competitor s The symbol s utilized here is are as follows Competitors Symbols Utilized Company Name Model Name A HONDA UMK 425LE B Makita EM 4251 ...

Page 3: ...3 PRECAUTIONS ON SALES PROMOTION 4 1 Safety Instructions 4 2 Specific Instructions for Customers 5 TROUBLESHOOTING GUIDE 6 REPAIR GUIDE 8 1 Precautions on Maintenance Inspection and Repair 8 2 Inspection Criteria for Each Section and Consumable Parts 8 Assembly Diagram for CG 25EUS ...

Page 4: ... Exhaust regulation g kWh CG 25EUS L THC NOx 50 or less 32 Comparison of engines HITACHI CG 25EUS L four cycle engine HITACHI CG 24EKS two cycle engine Engine oil consumption mL h 3 0 15 0 Idling dB 70 6 76 3 Racing dB 90 6 96 8 Noise level at operator s ear Equivalent mean dB 87 0 94 0 Lightest Weight in its Class The Model CG 25EUS features the lightest weight in its class of engine grass trimme...

Page 5: ... Other than U S A 550 mL U S A 500 mL Engine oil tank capacity 80 mL Starting method Recoil starter Ignition Fly wheel magnet type Spark plug NGK CMR 5H Carburetor Diaphragm with primer pump Stop switch Rocker type switch Throttle lever Trigger type Carrying Shoulder carrying single strap Handle Loop Handle Bike Handle Cutter blades Nylon cutter Blade rotation Counterclockwise when viewed from the...

Page 6: ...egulation mL Other than U S A 550 U S A 500 550 500 Engine oil tank capacity mL 80 80 80 Gas emission THC NOx g kWh 32 25 32 Fuel consumption g kWh 450 460 440 Oil consumption mL h 3 0 2 6 Front handle 4 8 5 8 5 2 Vibration level Rear handle m s2 3 2 8 3 5 6 Noise level dB A 87 91 87 Engine volume L 4 7 4 9 4 8 Outer dimensions L x W x H mm 1 790 x 393 x 296 1 770 x 368 x 305 1 760 x 330 x 265 Mas...

Page 7: ...r product repair A Handling Instructions Although every possible effort has been made in the design manufacturing and testing phases to ensure the safety of the Model CG 25EUS Engine Grass Trimmer this product inevitably involves an inherent risk in use To avoid unnecessary risk and ensure that the customer uses the product safely and efficiently the Handling Instructions describe safety precautio...

Page 8: ...ish the engine oil tank whenever the engine oil level is low Instruct the customer to replace engine oil after about 10 hours of initial operation when using this tool for the first time and then replace engine oil after every 50 hours of subsequent operation Note that more engine oil than normal is consumed during the initial 10 hours of operation 4 Proper storage Instruct the customer to remove ...

Page 9: ... its connection is faulty Repair or replace the part The high voltage cord or other cable is grounded Repair the part No spark The ignition coil broke or is faulty Replace the faulty part Short circuited due to foreign matter between the plug electrodes Remove the foreign matter If this problem recurs often disassemble the engine and clean the parts The piston ring is faulty The piston is worn A c...

Page 10: ... carbon The air cleaner is clogged Starts but when it accelerates Poor acceleration no increase in rpm Carbon accumulated on a valve Clean the part Fluctuating rpm at high speed The carburetor is clogged with foreign matter Clean the part Starts but Excessive fuel consumption The air cleaner is clogged Clean the part The piston ring is worn The cylinder is worn The piston is deformed Chain oil is ...

Page 11: ...e or spark plug that could cause a burn injury or electric shock Before operating this tool with its cutter blade make sure that no other person is around you When repairing this tool in a room or other location with poor ventilation be sure to ventilate the place After repair check whether the throttle lever returns to the idling position and the engine stops when you set the stop switch to the s...

Page 12: ...e is cracked or creased Replacement Air hole on tank cap is faulty Replacement Pump diaphragm of carburetor is faulty Replacement Carburetor is clogged with foreign matter Cleaning Piston ring is faulty Replacement Piston ring is worn Replacement Piston is worn Replacement Cylinder is worn Replacement Cam is damaged Replacement Crank gear or cam gear is damaged Replacement Valve is damaged Replace...

Page 13: ...nspection and replacement Idling speed is too low Adjustment Idling speed is too low Adjustment Idling speed is too high Adjustment Clutch is worn or faulty Inspection and replacement The speed fluctuates The engine stalls The engine stalls OK OK The speed does not increase OK Check whether the speed increases normally Check whether the engine can suddenly decelerate from high speed Check whether ...

Page 14: ... cloth to wipe off any fuel on the electrodes 2 Fit the Spark Plug NGK CMR5H 22 into the Spark Plug Cap 20 and bring the electrodes into contact with a metal part of the engine In this status set the Stop Switch 154 to the starting position and then pull the Starter Knob 86 3 When normal the electrodes of the Spark Plug NGK CMR5H 22 generate a flick and spark 2 Adjusting the gap formed between the...

Page 15: ... Idle Adjust Screw This screw adjusts the airflow rate at idling Turning this screw clockwise increases engine speed turning it counterclockwise decreases engine speed 2 Standard setting of carburetor Idle Adjust Screw 2 500 to 3 500 min 1 revolutions per minute Confirm that the cutter blade does not rotate 3 Fine adjustment Idling adjustment Turn the Idle Adjust Screw to adjust to the rpm speed a...

Page 16: ...e Rocker Arm 8 and Intake Valve 49 to check the valve clearance Adjust the valve clearance if outside the range from 0 1 to 0 2 mm 7 Use a wrench to fix the lower of the two Lock Nut M5 3 onto the Shaft Bolt 9 In this status loosen the upper Lock Nut M5 3 and then loosen the lower Lock Nut M5 3 CAUTION Loosening the upper Lock Nut M5 3 without the lower Lock Nut M5 3 being fixed will loosen the Sh...

Page 17: ... in order to remove the Clutch Shaft Comp 147 while being careful not to damage the ball bearing in the Fan Case 146 Reassembly While holding the inner ring of the ball bearing in the Fan Case 146 slowly press fit the Clutch Shaft Comp 147 and then mount the Retaining Ring for D12 Shaft 144 Mount Anti Vibe Rubber B 126 Pipe Holder B 125 Anti Vibe Rubber A 123 and Pipe Holder A 124 on the Fan Case ...

Page 18: ...5 Reassembly Wipe off any carbon from the exhaust inlet and outlet of the Muffler 12 and then mount the removed parts in the order shown in the figure below Tighten the Hex Socket HD Bolt M5 11 one after another in steps to prevent the Muffler 12 from being tilted Hex Socket HD Bolt M5 11 Muffler 12 Muffler Gasket A 13 Wind Guide Plate B 14 Muffler Cover A 15 Washer 5 105 ...

Page 19: ...sulator 25 remember to attach the Lock Nut M5 107 Mount the removed parts in the order shown in the figure below Before mounting the Cleaner Element 102 in the Cleaner Cover 103 wash the Cleaner Element 102 with gasoline and then dry it well Cover Fixing Bolt 104 Machine Screw W SP Washer M5 99 Cleaner Cover 103 Cleaner Element 102 Cleaner Body 94 Wind Guide Plate A 24 Insulator Gasket 23 Insulato...

Page 20: ...on 2 in Repair Procedures Finally check that the Stop Cord 141 and Earth Cord 143 are not damaged 5 Tank and Recoil Starter Ass y Disassembly Before disassembling the Tank 158 make sure that it contains no gasoline Loosen Hex Hole Bolt M5 x 25 S 162 and then remove the Stand 160 and Tank 158 To remove the Recoil Starter Body Ass y 80 loosen Seal Lock Screw M4 88 and then remove the Recoil Starter ...

Page 21: ...mounting the Magnet Rotor 138 in the crankshaft assembly degrease the engaging sections Attach the Clutch 134 to the Magnet Rotor 138 so that the arrow mark on the side of the Clutch 134 can be seen CAUTION To prevent damage to the Piston 60 be sure to disassemble and reassemble the Starter Pulley Ass y 93 Clutch 134 and Magnet Rotor 138 with the Crank Case Ass y B 73 and Cylinder A 47 assembled S...

Page 22: ... Exhaust Valve 50 and Intake Valve 49 and then mount the Exhaust Valve 50 and Intake Valve 49 in Cylinder A 47 When mounting be careful not to confuse the Exhaust Valve 50 with the Intake Valve 49 While holding the Exhaust Valve 50 or Intake Valve 49 from the combustion chamber side of Cylinder A 47 to prevent either valve from falling set the Stem Seal 19 only for the Intake Valve 49 Stem Seal Ba...

Page 23: ...ew W SP Washer M4 x 10 1 Cylinder Head Cover 2 Lock Nut M5 3 Pivot Rocker Arm 4 Rocker Arm 8 Push Rod 5 Intake Valve 49 Shaft Bolt 9 Push Rod Guide 10 Exhaust Valve 50 Cylinder A 47 Stem Seal 19 Stem Seal Base 18 Retainer Valve 16 Valve Spring 17 ...

Page 24: ...60 to fit the entire Piston Pin Circlip 61 into the groove Mount the piston rings in order of the Oil Ring 59 2nd Ring 58 and 1st Ring 57 To mount the Oil Ring 59 mount the expander first and then mount the scrapers When mounting the 2nd Ring 58 position it so that the R mark at its slit faces upward After mounting check that each piston ring turns smoothly and then turn the 1st Ring 57 to shift t...

Page 25: ...t 62 portion projecting from the mated surfaces of the crankcase FW and Crank Case ST Mount the Pump Gasket 51 and Base Pump 52 to the crankcase ST Mount these parts so that the chamfered section of Inner Rotor 53 can be seen with the chamfered section facing the Cover Pump 55 Mount the Inner Rotor 53 and Outer Rotor 54 to the Base Pump 52 Apply liquid gasket Three Bond 1207C to the Base Pump 52 s...

Page 26: ...M5 x 30 26 2 5 to 3 5 25 5 to 35 7 Crank Case Ass y B 73 6 Hex Hole Bolt M4 x 18 WS 79 3 6 to 4 4 36 7 to 44 9 Cylinder A 47 5 Hex Socket Bolt M5 46 8 0 to 9 0 81 6 to 91 8 Muffler 12 3 Hex Socket HD Bolt M5 11 6 0 to 8 5 61 2 to 86 6 Fan Case 146 3 Hex Socket HD Bolt W SP Washer M5 x 20 122 2 5 to 3 5 25 5 to 35 7 Tank 158 3 Hex Hole Bolt M5 x 25 S 162 4 25 to 8 5 40 8 to 86 8 Engine Cover 129 2 ...

Page 27: ...7 20 21 22 47 23 24 23 107 25 26 13 14 15 49 27 28 31 32 11 105 95 94 96 97 98 99 100 101 102 103 104 50 33 34 35 36 37 38 39 40 41 42 43 44 45 106 30 29 46 48 63 64 65 57 58 59 60 61 66 61 67 68 67 51 52 53 54 55 56 69 70 62 71 93 83 87 88 74 75 76 77 78 77 79 63 64 89 90 91 92 85 86 84 81 82 80 72 73 12 ...

Page 28: ...US 2 158 164 165 163 167 166 160 161 171 162 170 159 152 131 132 133 134 135 136 137 138 139 143 141 140 142 130 128 129 121 122 123 124 125 126 127 128 168 169 144 146 147 148 149 154 150 155 156 157 151 153 145 ...

Page 29: ... 216 222 223 224 225 226 227 215 214 213 212 211 199 210 200 201 202 203 204 205 206 207 208 209 198 501 505 228 229 230 231 232 233 234 236 502 503 504 507 181 183 150 152 191 152 190 250 184 185 187 186 188 249 189 192 221 247 182 151 248 235 194 217 218 219 220 242 243 ...

Page 30: ...L FITTING OF PLUG CAP 1 22 669 6473 SPARK PLUG NGK CMR5H 1 23 669 6450 INSULATOR GASKET 2 24 669 6451 WIND GUIDE PLATE A 1 25 669 6452 INSULATOR 1 26 880 561 MACHINE SCREW W WASHERS M5 X 30 2 27 669 6954 CARBURETOR GASKET 1 28 669 6955 CABLE ADJUSTER 1 FOR USA L CAN L 29 668 4872 LOCK NUT M6 1 FOR USA L CAN L 30 668 4629 THROTTLE WIRE FIXING PLATE 1 31 669 6956 INSULATOR GASKET B 1 32 669 6957 CAR...

Page 31: ...LLER D3 2 72 321 905 STEEL BALL D4 10 PCS 1 73 669 6960 CRANK CASE ASS Y B 1 INCLUD 63 64 71 72 74 668 5310 OIL FILTER BODY 1 75 669 0919 OIL FILTER 1 76 668 5407 BOLT WASHER D5 1 77 668 5311 CLIP 2 78 669 6435 FUEL PIPE 1 79 668 4599 HEX HOLE BOLT M4 X 18 WS 6 80 669 6470 RECOIL STARTER BODY ASS Y 1 INCLUD 81 86 81 SET SCREW 1 82 REEL 1 83 SPIRAL SPRING 1 84 STARTER CASE 1 85 STARTER ROPE 1 86 ST...

Page 32: ...7 FLYWHEEL NUT 1 137 668 5410 BOLT WASHER D8 1 138 669 6464 MAGNET ROTOR 1 139 668 4599 HEX HOLE BOLT M4 X 18 WS 2 140 669 6463 IGNITION COIL SET 1 141 669 6467 STOP CORD 1 142 669 6966 CORD INSULATION TUBE 1 143 669 6466 EARTH CORD 1 144 939 542 RETAINING RING FOR D12 SHAFT 10 PCS 1 145 CAUTION MARK 1 146 669 6480 FAN CASE 1 147 669 6481 CLUTCH SHAFT COMP 1 148 305 812 TAPPING SCREW W FLANGE D4 X...

Page 33: ...87 668 4714 HEX HOLE BUTTON SCREW 6 X 25S 2 FOR EUROPE 188 668 4709 HEX HOLE BOLT M5 X 25 S 4 FOR EUROPE 189 669 6576 HANDLE HOLDER A 1 FOR EUROPE 190 669 6588 HANDLE A 1 FOR EUROPE 191 302 012 NUT M5 BLACK 1 FOR EUROPE 192 669 6595 HANDLE LEFT 1 FOR EUROPE 193 669 6972 HANDLE HOLDER A 1 FOR USA L CAN L 194 669 6973 BARRIER 1 FOR EUROPE L AUS L NZL S 195 669 6974 BOLT BLACK M6 2 FOR EUROPE L USA L...

Page 34: ...93 HANGER 1 EXCEPT FOR USA L CAN L 228 COVER 1 229 NYLON CORD 1 230 SET SCREW 1 231 REEL 1 232 RETURN SPRING 1 233 BUTTON 2 234 CORD GUIDE 1 235 CASE 1 236 669 6454 NYLON HEAD ASS Y 1 INCLUD 228 235 237 669 6950 COVER GUARD 1 EXCEPT FOR USA L CAN L 238 668 4751 TAPPING SCREW 4 X 14 1 EXCEPT FOR USA L CAN L 239 668 4750 KNIFE 1 EXCEPT FOR USA L CAN L 240 669 6951 SAFETY COVER HOLDER 1 EXCEPT FOR US...

Page 35: ...CAN L 503 944 458 HEX BAR WRENCH 4MM 1 504 668 4768 CUTTER COVER 2 EXCEPT FOR USA L CAN L 505 875 769 SAFETY GLASSES 1 EXCEPT FOR USA L CAN L 506 669 6448 SHOULDER BELT SINGLE 1 EXCEPT FOR USA L CAN L 507 BLADE 3T X 230 X T1 8 1 EXCEPT FOR USA L CAN L 4 10 9 ALTERNATIVE PARTS STANDARD ACCESSORIES NO USED CODE NO ITEM NO ...

Page 36: ...CG 25EUS DESCRIPTION REMARKS 10 Printed in Japan 4 10 100409N ALTERNATIVE PARTS NO USED CODE NO ITEM NO ...

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