Shindaiwa HT230 User manual

GEARCASE AND CUTTERS
Shindaiwa HT230 and
DH230 Hedge Trimmers
SERVICE
MANUAL
SHINDAIWA SERVICE MANUAL
DH2301
HT230
DH230
WARNING!
The engine exhaust from this product
contains chemicals known to the State of
California to cause cancer, birth defects
or other reproductive harm.

䊚Shindaiwa Inc. 1998
2
Service Manual
Section page
1Model Identification/Specifications ....... 3
2Internal Gearcase Identification............. 5
3Theory of Operation ................................ 6
4Troubleshooting ...................................... 8
5Powerhead and Cutter Removal .......... 10
6Gearcase Disassembly/Inspection ...... 12
7Gearcase Reassembly .......................... 16
8Cutter Service ........................................ 18
9Cutter and Gearcase Maintenance ...... 23
10 Appendix
Special and Recommended Tools .......... 25
Torque Specifications .............................. 25
Metric Conversions ................................. 26
Contents
CAUTION!
A statement preceded by the word
CAUTION contains information that
should be acted upon to avoid damaging
your machine.
WARNING!
A statement preceded by the triangle
Attention Symbol and the word
WARNING contains information that
should be acted upon to prevent serious
bodily injury.
IMPORTANT!
A statement preceded by the word
IMPORTANT is one that possesses
special significance.
Shindaiwa HT230 and DH230
Hedge Trimmers
Gearcase and Cutters
Attention
Statements

䊚Shindaiwa Inc. 1998 3
HT2301
HT2302
Figure 1. Major Component Identification
Rear Handle
Bracket
Rear Handle and
Throttle Assembly
Powerhead
Gearcase
Air Cleaner
Cover
Hand Guard
and Front
Handle
Assembly
Guide
Bar
Cover
Protector
Cutters
Guide
Plate
Adjustable Shoulder
Bolts with Locking Nuts
DH2301
DH2302
HT230
DH230
Rear Handle and
Throttle Assembly
Powerhead
Air Cleaner
Cover
Hand Guard
and Front
Handle
Assembly
Guide
Bar
Cover
Cutters
Adjustable Shoulder
Bolts with Locking Nuts
Model Identification Section 1

䊚Shindaiwa Inc. 1998
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Section 1 Specifications
Specifications are subject to change without notice.
General Specifications HT230 & DH230
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
Weight; engine and Cutter (less fuel)
HT230-30 .................... 5.5 kg (12.2 pounds)
HT230-40 .................... 6.0 kg (13.2 pounds)
DH230-24 .................. 5.7 kg (12.5 pounds)
DH230-30 ................... 5.9 kg (13.9 pounds)
Engine Specifications
Engine Model ....................................... SHT230
Type ..... 2-cycle, horizontal cylinder, air cooled
Bore x Stroke .......................... 32 mm x 28 mm
Displacement ........................................ 22.5 cc
Dry Weight ...................... 2.6 kg (5.73 pounds)
Max. Output ....... 1.1 hp (0.81 kW) @ 8000 rpm
Fuel ................................. Gasoline-oil Mixture–
40:1 with Shindaiwa
Premium 2-cycle Engine Oil
Fuel Tank Cap., (HT230) ..... 0.7 liter/24 ounces
Fuel Tank Cap., (DH230) .... 0.6 liter/21 ounces
Carburetor ........ Walbro WYJ (diaphragm type)
Ignition ....Fully electronic, transistor controlled
Spark Plug ................................ Champion CJ8
Air Cleaner ................. Semi-wet type, silenced
Starting Method .............................. Recoil type
Drive and Cutters Specifications
HT230 Blade ......... Double-action, single edge
DH230 Blade .......Double-action, double edge
Blade Length
HT230-30 ......................................... 740 mm
HT230-40 ....................................... 1080 mm
DH230-24 ........................................ 605 mm
DH230-30 ........................................ 745 mm
Clutch Type .............Fully automatic centrifugal
clutch, dry type
Gear Type ....................................... Spur gears
Gear Reduction ...................................... 1:4.98
Gear Lubrication ............ Lithium-based grease
Standard Equipment
Rear handle with integral controls, anti-vibe
mountings.
Front handle with guard.
Tool set and blade cover (scabbard).
Options
Deflector shield (HT230 only)

䊚Shindaiwa Inc. 1998 5
Nomenclature
Figure 2. Internal Gearcase Components (shown inverted).
HT2329
Clutch Drum
Grease
Fitting
Upper Guide
Plate
Upper
Connecting
Rod
Sealed
Bearing
Shielded
Bearing
Thrust
Washer
Pinion
Shielded
Bearings
Thrust
Washer
Lower Guide
Plate
Lower
Connecting
Rod
Felt Seal
Gearcase
Cover
Gearcase
Cam
Gear
Internal Gearcase Identification Section 2
Gasket

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Section 3 Theory of Operation
Clutch
Figure 3
Gearcase
Figure 4
Clutch drum rotation is transferred directly to
the input pinion gear, which is in constant
engagement with the cam gear. The pinion-to-
cam gear combination reduces engine rpm by
a ratio of 1:4.98.
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.
Figure 3. Clutch Operation.
Figure 4. Reduction Gearing.
HT2337
HT2347
Cam Gear
Retraction
Spring
Clutch Drum
Shoe (swings
outward to engage)
Clutch
Drum
Pinion
Gear
1:4.98
Reduction

䊚Shindaiwa Inc. 1998 7
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 connect-
ing 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.
Connecting rod thrust is in turn controlled
by close-tolerances between the cam gear
faces and a set of hardened guide plates that
surround the small ends of the connecting
rods, held between a set of hardened guide
plates.
Via the connecting rods, cam rotation is
converted into reciprocating motion to drive
the cutting attachment.
Cutting
Attachment
Figure 6
The reciprocating end of each connecting rod
is bored to mate with a hardened drive stud at
the inner end of each of the two parallel
cutters, providing true “double action” perfor-
mance.
To allow independent cutter movement, the
individual cutters are slot-mounted over
special shoulder bolts threaded into a station-
ary guide bar attached to the gearcase
assembly.
Cutters are identified as “upper” and
“lower”, and are available with appropriate
length guide bars to provide cutting swaths of
varying widths.
Figure 5. Cam Gear and Connecting Rods
Figure 6. Cutter Drive Operation.
Theory of Operation Section 3
HT2348
HT2349
Eccentric
Lobe
Cam Gear
Lower Guide
Plate
Upper
Guide
Plate
Lower
Connecting
Rod
Upper
Connecting
Rod
Reciprocating
Action
Upper Cutter
Shoulder
Bolt
Guide Bar
(stationary)
Lower Cutter
Slot
Drive Stud
HT230 Shown

䊚Shindaiwa Inc. 1998
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Section 4 Troubleshooting
Performance and durability are highly depen-
dent 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.
Possible Cause
Shoulder bolts too loose
Cutter teeth dull
Shoulder bolts loose
or worn
Worn shoulder bolt slots
Clutch failure
Internal gear failure
Engine idle set too high.
Clutch retraction spring is
broken
Drive stud is broken
Connecting rod failure
Shoulder bolt(s) adjusted
too tight
Internal gearcase damage
Gear or connecting rod
failure
Gearcase too full
Felt seal damaged
Cover gasket damaged
Water in gearcase (possible
outside storage)
IMPORTANT!
Beyond outright abuse, gearcase life and
cutting performance are directly related
to both maintenance and adjustment.
Remedy
Adjust bolts per Section 8
Sharpen teeth per Section 8
Adjust or replace per Section 8
Replace clutch shoe assembly
Overhaul gearcase
Reset idle speed to 3000 ±250 rpm
Replace clutch assembly
Replace cutter per Section 8
Replace connecting rod: inspect for
internal gearcase damage
Readjust per Section 8
Inspect/overhaul gearcase
Inspect/overhaul gearcase
Section 9
Replace seal
Replace gasket
Drain and refill per Section 9
Problem
Poor cutting performance
Cutters not “tracking”
(non-parallel operation)
Cutters not moving, or
move very slowly
(engine revs)
Cutters will not
disengage
One cutter not moving
Cutters/engine revs slow;
engine may overheat
Excessive noise from
gearcase
Grease leaking from
gearcase at guide bar
Gearcase lube has white
“milky” appearance

䊚Shindaiwa Inc. 1998 9
HT2301
Figure 7. Common Causes of Cutter or Gearcase Problems
Troubleshooting Section 4
Tip
Damage
Dull or
Damaged
Cutters
Shoulder Bolts
Worn/Incorrectly
Adjusted
Poor
Lubrication
Dirt
Accumulation
Internal Gearcase
Wear
Low or Contaminated
Lubricant
Guide Plate
Worn/Damaged
Worn
Shoulder
Bolt Slots HT230 Shown

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HT2350
Section 5 Powerhead Removal
Powerhead
Removal–HT230
HT2306A
Figure 8. Disconnecting the throttle cable
and ignition wiring
Figure 9. Removing the Gearcase Assembly
and Rear Handle Bracket
Rear
Handle
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.
CAUTION!
Impact-type power tools can damage the
hedge trimmer drive assembly.
STEP 1. Disconnect the throttle cable end
from the throttle lever on the carburetor
(Figure 8).
STEP 2. Unplug the red ignition wire from the
ignition wire connector, and then tempo-
rarily remove the gearcase mounting bolt
to disconnect the black grounding wire
(Figure 8).
STEP 3. Remove the three 6 mm x 16 mm
gearcase mounting screws, and separate
the gearcase assembly from the
powerhead (Figure 9).
STEP 4. Remove the two 6mm x 35mm rear
handle bracket mounting screws, and lift
the rear handle assembly from the gear-
case (Figure 9).
Powerhead
Gearcase
Assembly
Gearcase
Mounting
Screw
Mounting
Screw
Rear
Handle
Bracket
Handle
Bracket
Mounting
Screw
Red
Ignition
Wire
Black
Ground Wire
Throttle
Lever
Air Cleaner
(removed for
clarity)
Cable End
Handle Bracket
Mounting Screw
Gearcase
Mounting
Screw
Ignition
Wire
Connector
Gearcase
Mounting Bolt

䊚Shindaiwa Inc. 1998 11
Powerhead Removal Section 5
STEP 1. Disconnect the throttle cable end
from the throttle lever on the carburetor
(Figure 10).
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).
Figure 10. Disconnecting the Throttle Cable.
Powerhead
Removal–DH230
DH2307A
Throttle
Lever
Air Cleaner
(removed
for clarity)
Red
Ignition
Wire
Cable End
Ignition
Wire
Connector
DH2306A
Rear Handle
Assembly
Powerhead
Gearcase
Mounting
Screws (3)
Black Ground
Wire
Figure 11. Removing the Powerhead Assembly from
the Gearcase Assembly
Gearcase
Assembly

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HT2332
HT2351
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. Working from the bottom of the
gearcase, remove the six 4mm x 15mm
gearcase cover screws and then remove
the gearcase cover from the gearcase
assembly Figure 13).
STEP 3. Lift out the felt grease seal. Unscrew
the two 6mm x 12mm guide plate retaining
screws, and then remove the lower guide
plate (Figure 14).
STEP 4. Remove and retain the thrust washer
from the cam gear (Figure 14).
Cutter Removal
Figure 13. Removing the gearcase cover.
Figure 12. Removing the cutter support bracket.
Figure 14. Grease seal and lower guide plate removal.
HT2333
Cover
Screws
Gearcase
Cover
Cutter
Support
Bracket
Gearcase
Bracket
Retaining Nuts
Lower Guide
Plate
Felt
Grease
Seal
Thrust
Washer
Cutter
Assembly
Shoulder
Bolt Nut
(6mm)
Shoulder
Bolt
Washer
Guide
Plate
Screws
Cam Gear
Guide Bar
Mounting Studs
Gasket
Section 6 Gearcase Disassembly
HT230
Shown

䊚Shindaiwa Inc. 1998 13
Removing the
Clutch Drum and
Pinion Shaft
Figure 16
Figure 15. Removing the upper con-rod and
cutters and guide bar assembly.
STEP 1. Temporarily lock the pinion shaft by
placing a 10mm open-end wrench over the
two flats at the inboard end of the shaft.
STEP 2. Insert tool p/n 99909-20230 into the
clutch drum bore, and engage the two pins
on the tool with the matching holes in the
clutch drum.
STEP 3. While using a firm grip to hold the
10 mm wrench, loosen and remove the
clutch drum in a clockwise rotation. If
necessary, use a heat gun to soften the
ThreeBond™ thread adhesive on the clutch
drum threads.
CAUTION!
Do not overheat the clutch drum and
pinion shaft. Excessive heat can damage
the pinion shaft bearings.
STEP 4. Use a plastic or wooden mallet to
remove the pinion shaft from the gearcase
casting.
Cutter Removal
continued
BEARINGS
ARE NOT
CAPTIVATE!
HT2330
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)
IMPORTANT!
If the connecting rod is to be reused,
mark it now for correct orientation on
reassembly.
STEP 6. Remove the cutters and guide bar as
an assembly (Figure 15).
Mark for
reinstallation!
Figure 16. Removing the clutch drum.
Cutters and Guide
bar Assembly
Lower
Connecting
Rod
Gearcase
HT2331
10mm Open-end
Wrench
Clutch Tool
P/N 99909-20230
Turn
clockwise
to remove
Pinion Gear
(note flats
provided for
wrench)
A shaft or pin may
be used to provided
added leverage.
Gearcase Disassembly Section 6
HT230 Shown

䊚Shindaiwa Inc. 1998
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HT2343
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.
IMPORTANT!
Careless handling will dislodge the
connecting rod bearings. The connecting
rod roller bearings are loose in the
connecting rod large end, and are easily
lost.
STEP 3. Remove the upper guide plate from
the gearcase.
Figure 17. Removing the cam gear and upper con-rod
IMPORTANT!
Gearcase bearing bores can be dam-
aged by improper bearing removal
techniques. If a bearing puller must be
used, be extremely careful not to “cock”
bearings during removal.
STEP 1. Use a heat gun or similar appliance
to warm the gearcase cover bearing bores
to approximately 212˚F (100˚C ), and then
remove the two cover bearings by tapping
the cover face down sharply against a flat
wooden surface (Figure 18).
STEP 2. Use a bearing puller equipped with
reversible jaws and a slide-hammer to
remove the cam bearing and the clutch
drum bearing from the gearcase housing
(Figure 19).
The gearcase should now be
completely disassembled
Bearing Removal
Figure 18. Removing gearcase-cover bearings.
Figure 19. Using a bearing puller.
HT2352
Upper
Connecting
Rod
(mark for
reinstallation)
Cam Gear
Thrust
Washer
Upper Guide
Plate
HT2335
HT2345
Expanding the
Bearing Bore
Tap the cover
sharply
Heat
Gun
Cover
Wood
Block
Puller with
Slide
Hammer
Section 6 Gearcase Disassembly

䊚Shindaiwa Inc. 1998 15
Gearcase Inspection Section 6
Figure 20. Inspecting gearcase components.
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 con-
necting rod) are accounted for after cleaning.
1. Inspect the gearcase housing and cover
castings for obvious cracks, distortion, or
damage to the bearing bores or cover
sealing flanges, and discard if noted.
Check the gearcase casting for stripped or
otherwise damaged threaded areas, and
discard if unrepairable.
2. Visually inspect all bearings for physical
damage, especially to protective covers on
sealed or shielded bearings, and discard if
found. Spin all bearings by hand, and
discard any bearing that feels rough, loose,
or is otherwise difficult to spin.
3. Examine both the pinion and cam gears for
excessive wear or obvious damage such as
chipped or missing teeth, and replace if
found. Be especially alert for damage to the
threaded end on the pinion gear, and also
to any pitting or other damage to the
connecting rod drive lobes on the cam
gear.
4. Inspect the clutch drum for cracks, distor-
tion, or damage to the hub area, and
replace if noted.
5. Use a strong lens to inspect the connecting
rod roller bearings for damage such as
chipping or pitting. Inspect the connecting
rod small-end bore for damage or out-of-
round; and the sides for signs of excessive
friction. Any damage or excessive wear to
either the connecting rod or roller bearings
requires connecting rod replacement as a
complete assembly.
6. Inspect the working surfaces of both guide
plates, and replace if any damage or
measurable wear is noted.
Cutter inspection is described in
Section 8,
Cutters .
HT2329B
1
3
2
6
4
5
Cover or housing
damaged
Guide plate
scoring
Worn or damaged
bearings
Connecting
rod wear
Gear teeth damaged
or missing/wear or
pitting to the cam lobe
Clutch drum
threads damaged

䊚Shindaiwa Inc. 1998
16
HT2348A
Figure 21. Bearing Installation.
Reassembly
Heat
Gun
Install new seal
p/n 20870-61630
Reassembly is basically the reverse of assem-
bly, 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.
Bearing Installations (Figure 21)
Shindaiwa recommends expanding each
bearing bore with a heat gun or other appli-
ance set to preheat the bore to approx. 100˚C
(212˚F). Individual bearings can then be easily
positioned by hand without the risk of damage
to the bearing bore. Note that hammering or
pounding bearings in place can damage both
bearings and bearing bores, and is not
recommended.
Connecting Rods (Figure 22)
■During connecting rod installation, be
extremely careful not to dislodge the
individual rollers from their bearing races.
■If the original connecting rods are being
reused, be sure to reinstall each connecting
rod in the same location and orientation as
removed.
■Install the upper and lower thrust washers
in the reverse order of removal.
Guide Bar
Install the guide bar assembly in the reverse
order of removal, and firmly tighten all fasten-
ers. If a torque wrench is available, torque
both of the guide bar mounting stud nuts and
also the two guide plate screws to
50-70kgf-cm.
■Install a new felt seal p/n 20870-61630
during assembly (Figure 23).
■Lubricate and adjust all shoulder bolts as
described in Section 9 of this manual.
HT2335A
HT2336
Figure 22. Reinstall connecting rods in original location
and orientation.
All rollers aligned.
Bearing count: 52
Lower Connecting
Rod
Upper
Connecting
Rod
Cam
Gear
Figure 23. Install a new felt grease seal.
HT2342
IMPORTANT!
The gearcase
assembly contains
both shielded and
sealed bearings!
The clutch-side
bearing on the
pinion shaft must
be a sealed-type
bearing, or grease
may enter the
clutch area.
Sealed
Bearing Shielded
Bearing
Bearing
Upper Thrust
Washer
Lower Thrust
Washer
Section 7 Gearcase Reassembly

䊚Shindaiwa Inc. 1998 17
Gearcase Reassembly Section 7
HT230 Shown
Figure 24. Applying thread adhesive to the
pinion gear threads.
Figure 26. Lubricating the gearcase.
Figure 25. Tightening the clutch drum.
Clutch Drum Installation
STEP 1. Apply several drops of ThreeBond™
p/n 13-60 thread adhesive to the pinion
gear threads, and then install the clutch
drum in a counter-clockwise rotation
(Figure 24).
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 3. Use tool p/n 99909-20230 to tighten
the drum firmly on the shaft
(Figure 25).
STEP 4. If a torque wrench is available, final-
tighten the clutch drum to 170-190kgf-cm.
Lubrication and Inspection (Figure 26)
Prior to gearcase cover installation, hand-pack
the gearcase to approx. 50-70% capacity with
Shindaiwa p/n 37-57 Gearcase Lube or
equivalent high quality lithium-based grease
(see Section 9).
Install the gearcase cover, and rotate the
clutch drum by hand to check for internal
binding. If noted, any binding or other such
problems must be corrected before the
gearcase can be returned to service.
Installation and Adjustments
■Install the gearcase and rear handle on the
powerhead in the reverse order of removal,
and firmly tighten the three gearcase-to-
powerhead mounting screws. If a torque
wrench is available, final-tighten the
gearcase mounting screws to
70-100 kgf-cm.
■Confirm correct throttle cable adjustment
by measuring throttle lever “free-play” of
0.010-0.020”. If necessary, turn the cable
adjustment fitting on the carburetor in or out
until throttle free-play is within the above
specifications.
Grease Gun
HT2346
ThreeBond™
p/n 13-60
HT2341
Torque Drum to
170-190kgf-cm
Clutch
Tool
10mm
Open End
Wrench
HT2333A
Approximate
Capacity: 40-50
grams (1.6 oz.)
HT2331
Reassembly
Procedures

䊚Shindaiwa Inc. 1998
18
Section 8 Cutter Service
Figure 27. Removing the Front Handle and Shield.
Cutter
Disassembly–
HT230
Remove the cutter assembly from the gear-
case as described in Section 5.
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.
STEP 3. Remove the two protector mounting
screws and washers, and then lift the
protector from the guide bar
(Figure 28).
Removing the Guide Plate (Figure 29)
STEP 1. Remove the 5 mm x 8 mm screw at
the outboard end of the guide plate.
STEP 2. Working at the inboard end of the
guide plate, remove the shoulder bolt lock
nut and then unscrew and remove the
shoulder bolt.
STEP 3. Slide the guide plate from the end of
the cutter assembly.
Removing the Cutters (Figure 30)
STEP 1. Loosen and remove each of the
remaining shoulder bolt lock nuts.
STEP 2. Unscrew all remaining shoulder bolts
from the guide bar, and remove the single
flat washer from beneath each shoulder
bolt head. Note the use and location of
three different shoulder bolt lengths on the
HT230.
Figure 28. Removing
the Protector.
Figure 29. Removing the
Guide Plate.
Figure 30. HT230 Cutters and Guide Bar
HT2344
HT2353 HT2354
The cutter assembly should now be
completely disassembled.
Protector
Guide
Plate
HT2344A
Flange
Nut
5 mm
Stud
Shoulder
Bolt
Cut off the
hand grip to
remove.
Screw
Guide
Plate
HT2355
Shoulder
Bolt
Guide Bar
Upper Cutter
Lower Cutter
Washer
Shoulder
Bolt
Locking Nut
Mounting
Studs
Shoulder
Bolt Slot

䊚Shindaiwa Inc. 1998 19
Cutter Service Section 8
Cutter
Disassembly–
HT230
Remove the cutter assembly from the gear-
case as described in Section 5.
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. Unscrew all shoulder bolts from the
guide bar, and remove the single flat
washer from beneath each shoulder bolt
head (Figure 32).
Figure 31. Removing the Front Handle and Shield.
DH2306B
6 mm x 35 mm
Capscrews
Figure 32. DH230 Cutters and Guide Bar
The cutter assembly should now be
completely disassembled.
Guide Bar
Upper Cutter
Lower Cutter
Washer
Shoulder
Bolt
Locking Nut
Mounting
Studs
Shoulder
Bolt Slot
Washer

䊚Shindaiwa Inc. 1998
20
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. Visually inspect the blade slots for
signs of damage or unusual wear, and then
test-fit a new shoulder bolt in each slot. Any
of the following are cause for rejecting a
cutter:
■Slot sides are irregular (nonparallel),
indicating operation with worn shoulder
bolts.
■Galling between blade and shoulder bolt
head. Usually indicates poor lubrication,
possibly combined with overtightening
shoulder bolts.
■Loss of blade thickness; blade slot
appears "dished" when viewed from edge.
Indicates poor lubrication, dirty operating
conditions.
STEP 3. Visually inspect the inner working
surfaces of the guide plate. If evidence of
galling or grooving are noted, the plate
must be replaced.
Figure 33. Inspecting the cutter and guide bar (shown inverted).
STEP 4. Inspect individual cutter teeth for
signs of damage, distortion, or unusual
wear. Any cutter showing wear or damage
such that repairs would require significant
reshaping of the cutter is cause for rejec-
tion.
STEP 5. Examine the shoulder bolts, and
reject any bolt with visible body wear or
damage to its head or threaded areas.
IMPORTANT!
Cutter performance and service life are
directly related to shoulder bolt lubrica-
tion and adjustment.
STEP 6. Visually inspect the guide bar for
damage, unusual wear, or distortion. Any of
the following are cause for rejection:
■ Bending or twisting (check against
straightedge).
■ Damage to the mounting stud shanks or
threads.
■ Stripped or otherwise damaged shoulder
bolt mounting threads.
STEP 7. Inspect the front hand grip and
guard assembly. The rubber hand grip can
be serviced as a separate part number;
damage to the guard requires replacing
both components as an assembly.
HT2340
"Dished"
appearance
Check for
damaged
shoulder bolts
Check for
damaged
cutter
teeth
Check for
damaged or
worn slots
Check for damaged
drive pins
HT230 Shown