SHINDAIWA SERVICE MANUAL SERVICE MANUAL GEARCASE AND CUTTERS Shindaiwa HT230 and DH230 Hedge Trimmers HT230 DH230 DH2301 WARNING! The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.
Service Manual Shindaiwa HT230 and DH230 Hedge Trimmers Gearcase and Cutters Contents Section page 1 Model Identification/Specifications ....... 3 2 Internal Gearcase Identification ............. 5 3 Theory of Operation ................................ 6 4 Troubleshooting ...................................... 8 5 Powerhead and Cutter Removal .......... 10 6 Gearcase Disassembly/Inspection ...... 12 7 Gearcase Reassembly .......................... 16 8 Cutter Service .....................................
Model Identification Section 1 HT230 Guide Plate Adjustable Shoulder Bolts with Locking Nuts HT2301 Cutters Protector Cover Powerhead Rear Handle and Throttle Assembly HT2302 Hand Guard and Front Handle Assembly Air Cleaner Cover Rear Handle Bracket Guide Bar Gearcase DH230 Adjustable Shoulder Bolts with Locking Nuts DH2301 Cutters Powerhead Hand Guard and Front Handle Assembly Rear Handle and Throttle Assembly Cover DH2302 Air Cleaner Cover Guide Bar Figure 1.
Section 1 Specifications General Specifications HT230 & DH230 Drive and Cutters Specifications Dimensions (L x W x H) HT230-30 ..................... 990 x 210 x 210 mm HT230-40 ................... 1330 x 210 x 210 mm DH230-24 .................. 1080 x 250 x 210 mm DH230-30 .................. 1220 x 250 x 210 mm HT230 Blade ......... Double-action, single edge Weight; engine and Cutter (less fuel) HT230-30 .................... 5.5 kg (12.2 pounds) HT230-40 .................... 6.0 kg (13.
Internal Gearcase Identification Section 2 Nomenclature Gearcase Cover Gasket Felt Seal Shielded Bearings Lower Connecting Rod Thrust Washer Lower Guide Plate Pinion Cam Gear Thrust Washer Shielded Bearing Upper Guide Plate Sealed Bearing Upper Connecting Rod Gearcase Grease Fitting HT2329 Clutch Drum Figure 2. Internal Gearcase Components (shown inverted). 䊚 Shindaiwa Inc.
Section 3 Theory of Operation Clutch Figure 3 Shoe (swings outward to engage) Crankshaft rotation is transferred to the gearcase through a bonded-shoe centrifugal clutch threaded to the engine crankshaft. Increasing engine rpm causes the clutch shoes to swing outward under centrifugal force, engaging with and turning the clutch drum on the gearcase. Retraction Spring HT2337 Clutch Drum Figure 3. Clutch Operation.
Theory of Operation Cutter Drive Figure 5 Each side of the cam gear is fitted with an eccentric lobe, and the two eccentrics are installed 180˚ opposite one another. Each eccentric is also fitted with a connecting rod mounted on roller bearings, allowing cam gear rotation to be converted to a reciprocating action at the opposing or small end of each connecting rod.
Section 4 Troubleshooting Performance and durability are highly dependent upon cutter condition, adjustment, and lubrication. For a truly “clean” cut, all cutters must be sharp, undistorted, and in otherwise good condition. For consistent cutting action over the length of the cutter, all shoulder bolts must be in good condition and properly adjusted to maintain cutter-to-cutter contact.
Troubleshooting Tip Damage Section 4 Guide Plate Worn/Damaged Dirt Accumulation Worn Shoulder Bolt Slots HT230 Shown Poor Lubrication Dull or Damaged Cutters HT2301 Shoulder Bolts Worn/Incorrectly Adjusted Low or Contaminated Lubricant Internal Gearcase Wear Figure 7. Common Causes of Cutter or Gearcase Problems 䊚 Shindaiwa Inc.
Section 5 Powerhead Removal Powerhead Removal–HT230 IMPORTANT! Service procedures for the HT230 DH230 powerhead are similar to those for the T230 trimmer and are described in Shindaiwa Grass Trimmers, Brushcutters and Lawn Edgers Service Manual, Form 60506. Air Cleaner (removed for clarity) Cable End Throttle Lever CAUTION! Impact-type power tools can damage the hedge trimmer drive assembly. Ignition Wire Connector STEP 1.
Powerhead Removal Powerhead Removal–DH230 STEP 1. Disconnect the throttle cable end from the throttle lever on the carburetor (Figure 10). Air Cleaner (removed for clarity) Section 5 Cable End Throttle Lever STEP 2. Unplug the red ignition wire from the ignition wire connector (Figure 10). STEP 3. Remove the three 6 mm x 16 mm gearcase mounting screws, and lift off the powerhead assembly from the gearcase (Figure 11). Ignition Wire Connector DH2307A Red Ignition Wire Figure 10.
Section 6 Gearcase Disassembly Cutter Removal STEP 1. With the gearcase oriented right-side up, remove the cutter support bracket (Figure 12): ■ Remove the two 6mm bracket retaining nuts from where the guide bar studs emerge from the gearcase. ■ Remove the single 6mm nut and washer from the shoulder bolt at the outer end of the holder bracket, and then lift the bracket from over the guide bar studs. STEP 2.
Gearcase Disassembly Cutter Removal continued STEP 5. Gently lift the lower con-rod from the cam gear. Be extremely careful not to dislodge the roller bearings from the large end of the connecting rod. All 52 bearing rollers must be accounted for! (Figure 15) Mark for Lower reinstallation! Connecting Rod Section 6 Cutters and Guide bar Assembly BEARINGS ARE NOT CAPTIVATE! IMPORTANT! If the connecting rod is to be reused, mark it now for correct orientation on reassembly. STEP 6.
Section 6 Gearcase Disassembly Removing the Cam Gear and Upper Con-rod Figure 17 STEP 1. Gently lift the cam gear and upper connecting rod from the gearcase. If the connecting rod is to be reused, mark it now for correct orientation on reassembly. STEP 2. Remove the upper connecting rod thrust washer from the gearcase. Cam Gear Upper Connecting Rod (mark for reinstallation) Upper Guide Plate IMPORTANT! Careless handling will dislodge the connecting rod bearings.
Gearcase Inspection Cleanup and Inspection Figure 20 Prior to inspection, use a solvent bath to thoroughly clean all components except the connecting rods, and then wipe or blow dry with compressed air. Connecting rods can also be cleaned with solvent, provided that all big-end bearing rollers (52 rollers per connecting rod) are accounted for after cleaning. 1.
Section 7 Gearcase Reassembly Reassembly Reassembly is basically the reverse of assembly, with the additions or exceptions as noted below. Note also that torque specifications have been listed for several key areas. CAUTION! The hedge trimmer can be damaged by overtightening of fasteners. For a complete listing of recommended torque specifications, see the Appendix.
Gearcase Reassembly Reassembly Procedures Clutch Drum Installation STEP 2. Temporarily lock the pinion shaft by placing a 10mm open-end wrench over the two flats at the inboard end of the shaft. STEP 4. If a torque wrench is available, finaltighten the clutch drum to 170-190kgf-cm. HT2346 Figure 24. Applying thread adhesive to the pinion gear threads. Torque Drum to 170-190kgf-cm Clutch Tool Lubrication and Inspection (Figure 26) Prior to gearcase cover installation, hand-pack the gearcase to approx.
Section 8 Cutter Service Cutter Disassembly– HT230 Remove the cutter assembly from the gearcase as described in Section 5. Flange Nut Removing the Front Handle STEP 1. Remove the 6mm nut and washer from the hand guard stud, remove the shoulder-bolt nut and washer, and then lift the hand guard assembly from the guide bar (Figure 27). STEP 2. If the hand grip is to be replaced, use a sharp knife to cut the grip lengthwise before peeling it from the guard. 5 mm Stud STEP 3.
Cutter Service Cutter Disassembly– HT230 Remove the cutter assembly from the gearcase as described in Section 5. Section 8 6 mm x 35 mm Capscrews Removing the Front Handle STEP 1. Remove the two 6 mm x 35 mm socket head capscrews securing the front handle (Figure 31). STEP 2. Remove the front handle. Removing the Cutters (Figure 32) STEP 1. Loosen and remove each of the shoulder bolt lock nuts. STEP 2.
Section 8 Cutter Service Inspecting the Cutter and Guide Bar Figure 33 STEP 1. Check the drive pin at the inboard end of each cutter. A loose, missing, or otherwise damaged drive pin cannot be repaired. Where noted, such damage requires cutter replacement. ■ Damaged drive pins are most often the result of allowing the moving blade tips to impact against a wall or sidewalk during operation, but can also be caused by incorrect shoulder bolt adjustment. STEP 2.
Cutter Service Reassembling the Cutter and Guide Bar– HT230 Figure 34 Section 8 STEP 2. Install the front handle assembly over its mounting stud and shoulder bolt. IMPORTANT! Unless the cutters are being replaced with new or reconditioned components, all cutting teeth should be sharpened before reassembly. For recommended sharpening procedures, please see Section 9. ■ Install a flat washer and nut over the front handle mounting stud, and tighten the nut securely.
Section 8 Cutter Service Reassembling the Cutter and Guide Bar– HT230 Figure 34 STEP 2. Install the holder support bracket over the innermost shoulder bolt, and loosely secure the assembly with a spring washer and shoulder bolt locknut. IMPORTANT! Unless the cutters are being replaced with new or reconditioned components, all cutting teeth should be sharpened before reassembly. For recommended sharpening procedures, please see Section 9. STEP 3.
Cutter and Gearcase Maintenance Sharpening the Cutters Figure 36 A sharp and properly adjusted cutting assembly should produce a clean, chisel-like cut. A dull or improperly adjusted assembly tends to produce a rougher, shredding-type cut, and also places additional demands on both the operator and the machine. Frequent touch-up of the cutter edges can be accomplished without disassembling the machine, and requires the use of grinding stones to dress the cutter edges as described in Steps 3 and 4 (below).
Section 9 Cutter and Gearcase Maintenance Shoulder Bolt Adjustment STEP 1. Loosen all shoulder bolt locknuts (at least one full turn each). Figure 40 STEP 2. Tighten all shoulder bolts firmly, and then loosen each shoulder bolt approximately 1/4-1/2 turn. Locknut STEP 3. Working from the powerhead, lock each shoulder bolt in place by firmly tightening its locknut while preventing the shoulder bolt from turning. STEP 4. Shoulder bolt adjustment is correct when there is (approximately) a 0.025– 0.
Appendix Section 10 Special and Recommended Tools CYL-56 HT2346A Clutch Drum Spanner p/n 9990920230 Piston Stop (nylon) p/n 22155-96240 Puller Assembly p/n 20000-96104 T-Wrench (allen type) p/n 22155-96521 (3mm) p/n 22155-96531 (4mm) p/n 22155-96540 (5mm) ThreeBond™ Thread Sealant p/n 13-60 Figure 44. Special tools recommended for servicing the Shindaiwa HT230 and DH230 Hedge Trimmer.
Section 10 Appendix Metric Conversions Length 1 in. = 25.4 mm 1 mm = .03937 in. 1 in. = 2.54 cm 1 cm = .3937 in. 1 ft. = 30.48 cm 1 cm = .0328 ft. 1 ft. = .304 meter 1 meter = 3.28 ft. 1 mile = 1.609 km 1 km = .621 mile 1 cu. in. = 16.39 cc 1 cc = .061 cu. in. 1 cu. in. = .061 liter 1 liter = 61.02 cu. in. 1 fl. oz. = 29.574 ml 1 ml = .0338 fl. oz. 1 fl. oz. = .02957 liter 1 liter = 33.81 fl. oz. 1 gal. = 3.785 liter 1 liter = .264 gal. 1 oz. = 28.35 gm 1 gm = .0353 oz. 1 lb. = .
Notes 䊚 Shindaiwa Inc.
1998 Shindaiwa Inc. Form No. 61305-1 Printed in U.S.A. Shindaiwa is a registered trademark of Shindaiwa Inc. SHINDAIWA SERVICE MANUAL Shindaiwa Inc. 11975 SW Herman Road P.O. Box 1090 Tualatin, OR 97062 Phone 503 692-3070 FAX 503 692-6696 www.shindaiwa.
