background image

16

Valve Adjustment

Remove cylinder cover, rocker arm cover, and set piston at TDC-compression.  

1. 

Loosen adjuster locknut so that the  

2. 

2.5 mm Allen socket head adjustment screw can turn freely. 
Insert feeler gauge .004 (0.10 mm) for both intake and exhaust; between valve 

3. 

stem tip and rocker arm. 
Turn adjustment screw (clockwise = tighter, counter-clockwise = looser) until 

4. 

feeler gauge is almost snug.  Back off just enough to allow gauge to slip out with 

limited resistance. 
While holding adjustment screw in place with Allen driver, tighten locknut with wrench. 

5. 

Turn engine over several times, and return to TDC-compression. Recheck with proper 

6. 

feeler gauge to make sure clearance adjustment did not change as a result of tighten-

ing locknut. Readjust as necessary. 
Replace rocker arm cover gasket to assure proper sealing and install cover. 

7. 

IMPORTANT!

If new gasket is not available and/or old gasket is not damaged, old gasket may 

be reused. Never use cracked or damaged gaskets! 

Figure 24

Figure 25

Figure 23

Summary of Contents for DH254

Page 1: ...MANUAL DH254 HEDGE TRIMMER Minimize the risk of injury to yourself and others Read this manual and familiarize yourself with the contents Always wear eye and hear ing protection when operating this un...

Page 2: ...lass by itself IMPORTANT The information contained in this manual describes units available at the time of publication While every attempt has been made to give you the very latest information about y...

Page 3: ...Avoid using or storing this unit in a wet environment Water on the cutters may enter the gearcase and damage your unit Always wear eye ear and hand protection while operating this unit Always wear clo...

Page 4: ...tangled Do not operate with broken or damaged equipment When cutting a branch that is under tension be alert for spring back so that you will not be struck by the moving branch If a cutter should bind...

Page 5: ...xH 1100 x 255 x 230 mm 43 31 x 9 65 x 9 06 in 1220 x 255 x 230 mm 48 03 x 9 65 x 9 06 in Fuel Tank Capacity 0 55 liter 18 6 oz Fuel oil ratio 50 1 with ISO L EGD or JASO FD class engine Oil Carburetor...

Page 6: ...may be applicable to California models only WARNING Do not make unauthorized modifications or alterations to this machine or any of its components or accessories Unit Description IMPORTANT The terms l...

Page 7: ...knuts C closest to handle Retain remaining 4 5 locknuts for future use Note Use new locknuts every other time blade stiffener is installed or removed Assembly Note For normal cutting Shindaiwa strongl...

Page 8: ...ine from harmful carbon build up maintain engine performance and increase engine life Shindaiwa Red ArmorTM engine oil exceeds ISO L EGD and J A S O M345 FD performance requirements Engine problems du...

Page 9: ...f of the required amount of 1 gasoline 2 Add the proper amount of engine oil to gasoline 3 Close container and shake to mix oil with gasoline 4 Add remaining gasoline close fuel container and remix 5...

Page 10: ...andle rapidly outward 3 Cranking the Engine CAUTION The recoil starter can be easily damaged by abuse Always engage the starter before attempting to crank the engine Never pull the starter cord to its...

Page 11: ...eases engine speed causing the clutch to engage and operate the cutters Releasing the throttle decreases engine speed causing the cutters to slow and then stop altogether as the clutch disengages Use...

Page 12: ...clogging and clean as necessary Clean under the cylinder cover and around the spark plug Inspect the air filter element for clogging clean as necessary Check for loose damaged or missing components an...

Page 13: ...stream at the inside face of the filter only Install the filter element pre filter and 6 cover in the reverse order of removal CAUTION Never operate the unit if the air cleaner assembly is damaged or...

Page 14: ...Remove and clean the cylinder cover and clean grass and dirt from the cylinder fins Every 50 hours of operation more often in dusty or extreme conditions Clean Debris Hooked Wire Figure 18 50 Hour Ma...

Page 15: ...r Remove the gearcase cover and use solvent and a soft brush to remove all old grease from the gearcase To refill hand pack the gearcase with ap proximately 40 50 grams of high quality lithium based g...

Page 16: ...ff just enough to allow gauge to slip out with limited resistance While holding adjustment screw in place with Allen driver tighten locknut with wrench 5 Turn engine over several times and return to T...

Page 17: ...ler Bolts Spark Arrester Screen Cover Cover Screws Muffler Gasket Engine Cover Screws Muffler Spark Arrester Cover Carburetor Adjustment Engine Break In New engines must be operated a minimum duration...

Page 18: ...torage Clean external parts thoroughly and apply a light coating of oil to all metal surfaces Drain all the fuel from the carburetor and the fuel tank To do so Prime the primer bulb until no more 1 fu...

Page 19: ...lter and or vent Priming pump not functioning properly The ignition switch is in O OFF position Shorted ignition ground Faulty ignition unit If the plug is wet excess fuel may be in the cylinder The p...

Page 20: ...d oils at 50 1 gasoline oil ratio Clean repair or replace as necessary Consult with an authorized Shindaiwa servicing dealer Service the air cleaner element Tighten or replace the spark plug Check the...

Page 21: ...ed Replace the spark plug Check the Specifications section for the correct plug and gap for your unit Restart Idle engine until cool Symptom Possible Cause Remedy Engine stops abruptly Engine dif cult...

Page 22: ...questions concerning Shindaiwa s Warranty Statement you can contact our Consumer Product Support Department at 1 800 673 1558 or contact us through the web at WWW SHINDAIWA COM PRODUCT WARRANTY PERIOD...

Page 23: ...e operator s manual is the customer s responsibility Failures due to improper set up pre delivery service or repair service by anyone other than authorized Shindaiwa servicing dealer during the warran...

Page 24: ...ned built and equipped to conform with applicable EPA and C A R B emissions standards and that your equipment SORE is free from defects in material and workmanship that would cause it to fail to confo...

Page 25: ...25 NOTES...

Page 26: ...26 NOTES...

Page 27: ...27 NOTES...

Page 28: ...on WWW SHINDAIWA COM When presenting your unit for Warranty service repairs proof of purchase is required Consumer Product Support If you require assistance or have questions concerning the applicatio...

Reviews: