Onfoot
Well-Known Member
Was looking forward to taking Hanna out to clear our first dump of snow for the year. I let the circulating heat pump warm things up for a couple of hours (it being -18C / 0F). She started without issue. But there was a 'wop/wop/wop' noise coming from something in the control box and it broke the shear pin. I replaced the shear pin and re-started her, with same result.
"Hmmm," I wondered... "Could it be related to being cold?" It was -31C / -24F yesterday. But last winter that had not been an issue. Anyway, I let her run with the cab heater on long enough to take the chill out. Then I shut her down and replaced the shear pin and restarted. This time no 'wop/wop/wop" noise. But then I raised the LH side of moldboard. It raised without issue, but when I released the lever back to neutral, there was the wop/wop/wop noise for just a bit, and then it stopped. I then raised the RH side--same thing, but this time wop/wop/wop and silence--the shear pin sheared. I repeated this a few more times, with same results on every control lever. Sometimes the noise would stop. But the next lever would create the noise again and inevitably the pin would shear.
I have the service manual, but cannot find any trouble shooting description of Hanna's symptoms. I have a sinking feeling that I'm going to need to dissemble the control box. I think the front can be removed to see what might be going on.
Way out of my depth on this, but such is life. Grateful for the wisdom of the forum community. I do wish it had happened in the summer, mind you. Working outdoors this time of year is tedious. (Thinking of you, Fat Dan!) Ah well.
"Hmmm," I wondered... "Could it be related to being cold?" It was -31C / -24F yesterday. But last winter that had not been an issue. Anyway, I let her run with the cab heater on long enough to take the chill out. Then I shut her down and replaced the shear pin and restarted. This time no 'wop/wop/wop" noise. But then I raised the LH side of moldboard. It raised without issue, but when I released the lever back to neutral, there was the wop/wop/wop noise for just a bit, and then it stopped. I then raised the RH side--same thing, but this time wop/wop/wop and silence--the shear pin sheared. I repeated this a few more times, with same results on every control lever. Sometimes the noise would stop. But the next lever would create the noise again and inevitably the pin would shear.
I have the service manual, but cannot find any trouble shooting description of Hanna's symptoms. I have a sinking feeling that I'm going to need to dissemble the control box. I think the front can be removed to see what might be going on.
Way out of my depth on this, but such is life. Grateful for the wisdom of the forum community. I do wish it had happened in the summer, mind you. Working outdoors this time of year is tedious. (Thinking of you, Fat Dan!) Ah well.