Wallfish 698 #1 Posted November 18, 2014 Courtesy of Webhead Uses the larger 20A engine 2 pmackellow and HeadExam reacted to this Share this post Link to post Share on other sites
Wallfish 698 #2 Posted November 18, 2014 Link to Ford saw video http://www.youtube.com/watch?v=XNjz5u8-e38 Share this post Link to post Share on other sites
Timm 5 #3 Posted December 12, 2014 Any one know how to open the case and repair the chain oiler pump? Share this post Link to post Share on other sites
Wallfish 698 #4 Posted December 12, 2014 I have a similar model, a Mark II but never opened it up. The tank has to split somewhere and like most O&R equipment, you'll need to dismantle quite a bit of it to get at the part you need to fix. I know the oil pumps in the Mustang saws get caught up when the pump's piston gets pushed in too far but can easily be "unstuck" through the filler hole with a small screwdriver. This seems to occur when the tank has been left dry for long periods with no oil in it. You might be able to do the same thing if the problem is that it's stuck in the pushed position. Share this post Link to post Share on other sites
Timm 5 #5 Posted December 13, 2014 Thanks, I'll look. Share this post Link to post Share on other sites
Webhead 95 #6 Posted December 15, 2014 Just dig in to it. You will figure it out. I have quite a few parts to this style saw, including oil pump parts, I believe. Share this post Link to post Share on other sites
Dap1961 6 #7 Posted August 17, 2016 I have one like that. Needs a carb. Do you know the model of carb it uses? Share this post Link to post Share on other sites
factory 487 #8 Posted August 17, 2016 (edited) Looks like my Challenger Mark IID chain saw is fitted with a Walbro HDC6 carb, I will have to double check tomorrow as the picture isn't very clear. Are there any other bits missing? Also is the engine type the same as mine, 20A-258? It should be on a plate like this. David Edited August 18, 2016 by factory Corrected carb part no. Share this post Link to post Share on other sites
Dap1961 6 #9 Posted August 18, 2016 Here's my tag and the carb compartment. Share this post Link to post Share on other sites
factory 487 #10 Posted August 18, 2016 Your engine is model 20A-274, so there are probably some slight differences to mine, I suspect the starter mechanism will be different as mine has the early type. I took the carb off mine for a better look at the model number, the carb fitted is a Walbro HDC6 (I've corrected the previous post). Also I have found the first error with the model 20A maintenance manual, as the carb has a right angle fuel inlet and the manual shows an incorrect carb model no. below the picture. Here are some pictures of the carb and the other parts you may be missing. I thought mine was complete but it seems the fuel lines to the carb are missing. The tank outlet is hidden under the starter mechanism housing. David Share this post Link to post Share on other sites
Dap1961 6 #11 Posted August 18, 2016 Thanks for the info and pictures. I'll take a closer look at mine over the weekend. Share this post Link to post Share on other sites
factory 487 #12 Posted August 18, 2016 Found the engine diagram for the Model 20A-274 in this thread, PM Wallfish as he has the original. David Share this post Link to post Share on other sites
Dap1961 6 #13 Posted August 18, 2016 Thanks. Helps alot. Share this post Link to post Share on other sites
CNew 404 #14 Posted June 2, 2019 Hello, Curious if anyone on this chain discussing the Mark II chainsaw has ever ended up rebuilding the HDC 6 carburetor. If so, did you buy a repair kit and do you have the part number? I’ve done some research for the HDC 6 carburetor and all I’m coming up with is a repair kit number of K10-HDC and wondering if this will work. Thanks, Clint Share this post Link to post Share on other sites
factory 487 #15 Posted June 3, 2019 Try asking Webhead, he may still have some original O&R rebuild kits, that's where I got mine from. @revmix used a K10-HDC repair kit from China bought on eBay. David Share this post Link to post Share on other sites
CNew 404 #16 Posted June 3, 2019 Excellent, I may grab a K10-HDC kit just to have handy. Share this post Link to post Share on other sites