I have a brand new German made Boomag 58cc 20" chainsaw and am having trouble attaching the blade arm to the engine. I loosen the two bolts but the cover attached to the chain stop bar won't come loose. I don't have the manual. Could anyone talk me thought it or put me in the direction of getting hold of manual? Appreciate it.

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Hope this is it!
Anthony

Hold blade and loosen bolt. If you have a impact use that. If not hold blade tight and loosen the bolt.

I’m happy to assist further over the phone at https://www.6ya.com/expert/christopher_722ea729aae6fd07

Loosen the bolt on the tensioner pulley with a socket wrench to release the pressure on the main belt. Note how the belt is looped around the pulleys so you can put it back properly and then remove the belt from the pulleys.
Locate the bolts on the back of the fan blade and remove the bolts with an open-end wrench. Once the fan blade is loose, remove it from the engine compartment.
Remove the fan pulley from the front of the water pump by unbolting the four bolts that attach the units with a socket wrench. Detach the four nuts that are holding the water pump to the engine block with a socket wrench.
Tap the water pump with a rubber mallet to loosen the seal and pull it away from the engine. Clean any debris away from the engine block where the water pump was attached with a wire brush.
Place a layer of white lithium grease around the O-ring that was included with the new water pump. Position the new water pump and O-ring over the engine block and attach the pump using a socket wrench to secure the pump with nuts.
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Lawn mower blades bolts are reversed thread. Its righty loosen, lefty tighten....

You loosen the two bolts on the bar closest to the engine, then loosen the tensioning screw alongside the bar, also near the engine. This will give you the slack that you need to remove the chain. If the chain is old, that is, stretched out from use, be prepared to loosen the tensioning screw a good bit in order to get the new chain on.
Best regards, --W/D--

The blade is held in place by a bolt. Some models have a locking mechanism for the shaft. some do not. Either depress the spindel lock or use a piece of wood or similar to stop the blade from rotating and using the correct wrench size for the bolt head, turn the bolt counter clockwise to loosen and remove the nut. Insert the new blade and reverse the process by hoding the blade in place and tightening the bolt head clockwise

remove cover at base of chain arm. loosen nuts holding arm in place. loosen tensioner. The chain should come off. put on new chain tighten tensioner until guides on inside of chain are just inside of groove while pulling on chain at center of arm. ( Make sure the chain saw if off while doing.)

Miter saws usually are left threaded...so you turn it clockwise to loosen. There should be a lock near the handle so you can lock the blade to loosen.

I had a similar problem, took mine to a car mechanic and he was able to fix it, no problems so far. Do you know where i might get the manual for this Boomag 58cc model? Cheers

insert scewdriver between wiper blade and wiper arm and apply a little force to remove wiper blade