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Stihl MS 440/044 Chainsaw

Stihl MS 440/044 Chainsaw. SECTION: Tools and Equipment ISSUED: 02-2011 REVISED: ##-####. Objectives. To provide an understanding of the following Specifications Use Maintenance Safety. STIHL MS 440/044 20” Bar Chain 33 cutting teeth Carbide tipped HD air filter with pre-filter.

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Stihl MS 440/044 Chainsaw

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  1. Stihl MS 440/044 Chainsaw SECTION: Tools and Equipment ISSUED: 02-2011 REVISED: ##-####

  2. Objectives • To provide an understanding of the following • Specifications • Use • Maintenance • Safety

  3. STIHL MS 440/044 20” Bar Chain 33 cutting teeth Carbide tipped HD air filter with pre-filter 2 stroke engine 5.2 horse power 50:1 pre mix Spark plug Bosch WSR6 F or NGK BPMR 7A Idle RPM-2,500 Max RPM-13,500 Specifications

  4. Use • Vertical ventilation • Forcible entry • Cutting timber and brush • Cutting lumber • Shoring operations

  5. Control Lever Positions • Stop • Run • Half choke • Choke Interlock and throttle must be depressed to switch from run to half choke or choke

  6. Parts • Chain brake • Manual and inertia operated • Decompression valve • Allows for an easier and quicker start

  7. Parts • Chain catch • Reduces risk of operator contact with chain should it break or derail • Chain tensioner • Allows for chain tension adjustment

  8. Starting Procedures • Ground starting method • Place saw on ground • Disengage chain break • Ensure control lever is in choke position • Hold handle firmly with left hand

  9. Starting Procedures • Place foot firmly in handle • Pull starter grip • Repeat until engine fires • Adjust control lever to half choke • Pull starter grip until saw starts and runs

  10. Starting Procedures • Quickly depress interlock and throttle • Places saw in run position • Do not pull start rope to its full extension

  11. Starting Procedures • Drop starting method • Ensure brake is disengaged • Ensure control lever is in choke • Hold handle with left hand • Hold starter grip with right hand

  12. Starting Procedures • Raise saw slightly above waist • Let saw drop in a controlled manner • Pulling starter grip • Repeat until saw fires • Adjust master control valve to half choke

  13. Starting Procedures • Continue to drop and pull starter grip until saw fires and runs • Quickly squeeze throttle and interlock • Puts saw in run position • Do not pull start rope to its full extension

  14. Procedures • Disengage brake • Rest tip of the saw’s bar on ground or roof • With left hand, keep thumb on handle • Pull back on the chain brake to disengage

  15. Procedures • Stopping the Chain • Release throttle to bring saw to idle • Engage chain brake with back of left hand while holding handle • Turn saw off by raising control lever to the stop (top) position • Always place saw in ready to run position when placing back into service • Brake disengaged, throttle trigger interlock depressed and the control lever in the choke position

  16. MaintenanceBasic • Refuel after use • Refill chain bar oil whenever you refuel • Adjust chain tension ensuring the chain can slide across the bar • Approximately 1/16” gap between bar and chain • Rotate guide bar when chain is removed to extend bar life • Inspect chain for damage • Replace when 3 consecutive teeth or 6 total teeth are missing or when a tie strap is broken • Saw may need a complete tear down to ensure it is thoroughly cleaned of all dirt and debris • Pay extra attention to the cooling fins. Over time they can accumulate “gunk” and cause the saw to overheat.

  17. MaintenanceAdvanced • Recommended tools • Scrench • Stihl combination wrench • Stihl flathead screwdriver • Larger flathead screwdriver • Stihl provided torques style wrench • Cleaning solvent or WD-40

  18. Air Filter System • Set master control lever to full choke • Open the twist lock above and remove the carburetor box cover

  19. Air Filter System • Remove filters and check outer butterfly position • Ensure its closed • Separate filter components • Clean filters by using compressed air • Blowing from the inside out • In case of stubborn dirt, wash filters with warm soapy water • Rinse from the inside out • Let air dry Outer Butterfly Felt Prefilter HD Filter Standard Filter

  20. Clutch and Chain Assembly • Unscrew the nuts and remove chain sprocket cover • Note side of stamped serial numbers or graphics on chain bar • Bar must be flipped when re-installed Stamped Serial #

  21. Chain and Bar Removal • Loosen chain by turning tensioning screw counterclockwise • Once chain starts to sag on the bottom of the bar, remove the bar and chain Chain Tensioning Screw

  22. Chain and Bar Cleaning • Use parts cleaner to thoroughly clean chain and bar • Inspect chain and determine if it needs to be out of service. • 3 missing teeth in a row • 6 missing teeth total • 1 broken link • Use a small screwdriver to remove debris from the bar chain guide • Use compressed air to blow excess solvent from the chain and bar and dry with a rag

  23. Powerhead Cleaning • Remove the inner side mounting plate by removing the screw adjacent to the tensioning screw • Remove the chain catcher with the Stihl torx wrench

  24. Powerhead Cleaning • Removing the E clip from the crank shaft using small screwdriver • Remove clutch drum assembly • Place the needle cage in a cap full of bar oil to lube Clutch Drum Rim Sprocket Needle Cage Washer E-Clip

  25. Powerhead Cleaning • Use compressed air to blow as much debris off of the powerhead • Remove the two cover plates using the Stihl torx wrench • Use the parts cleaner to further clean the powerhead • Use caution with the solvent avoiding the carburetor intake • Clean thoroughly • Use compressed air to blow off any excess solvent and dry with a rag

  26. Powerhead Cleaning • Clean all parts using the parts cleaner • Use compressed air to blow off excess solvent and dry with a rag • Set aside once cleaned and try to keep everything organized

  27. Chainsaw Reassembly • Now reassemble the powerhead in reverse order • Starting with the following • 2 cover plates • Clutch drum assembly • When installing the clutch drum, rotate and apply slight pressure until the oil pump drive spring engages the slot on the outside diameter of the drum • There should be a noticeable connection when the drum catches and drops into place • The slot on the drum is identified with a mark located on the face of the drum

  28. Chainsaw Reassembly • Continue reassembling in the following order • Chain catcher • Inner side plate • Bar and chain • Sprocket cover • Air filter • Carburetor box cover

  29. Chainsaw Reassembly • Replace bar and chain • Ensure the bar is flipped to the opposite side from where it was initially assembled • This will help with wear over time • Ensure the chain is properly seated in the bar and sprocket

  30. Chainsaw Reassembly • Apply tension to the chain by turning the chain tension screw clockwise • Take some of the sag out of the chain • Install the sprocket cover and finger tighten the two nuts

  31. Chainsaw Reassembly • Adjust the tension of the chain • Appropriate tension has been applied when: • With a gloved hand, pull the chain upward from the middle of the bar to create a gap equal to the width of a nickels edge being exposed between the chain and bar • With the chain brake off, the chain can be spun around the bar • Use the Scrench to finish tightening the sprocket cover nuts until snug • Do not over tighten

  32. Chainsaw Reassembly • Refuel with 2 stroke pre-mix 50:1 fuel • Top off bar oil • Test Run • Ensure adequate chain lubrication by running at full throttle and aiming saw towards the ground • A light spray pattern of oil should begin to form on the ground • Adjust if necessary • Re-adjust chain tension if necessary • Place back into service in the “Ready Run Position”

  33. Chainsaw Maintenance • Refer to Stihl Owner’s Manual for further maintenance needs • http://www.stihlusa.com/stihl_ownersmanuals/044_Manual.pdf

  34. Safety • Always wear proper PPE when operating chainsaws. • Minimum- helmet, eye protection, gloves, and hearing protection while performing maintenance • Avoid cutting overhead and inline with body • Maintain a firm grip at all times • Cut at full throttle

  35. Safety • Common reactive forces when cutting • Kickback • Occurs when saw chain near upper quadrant of bar nose contacts a solid object causing the saw to fling up and back in an uncontrolled arc • Pushback • Occurs when the chain on the top of the bar is suddenly stopped or caught, driving the saw straight back into the operator • Pull in • Occurs when the chain on the bottom of the bar is suddenly stopped or caught, causing the saw to be pulled forward • Let the saw cool before refueling

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