We have a mid-90s Timberjack 1210 forwarder that we have been using around the farm to clean up windfall and to process firewood. A rather annoying problem I have with this guy, is if we stall the engine while loading, the motor can be very temperamental to get restarted, often requiring a shot of ether to get the motor running again. This typically happens when the engine is warm - cold starts are not really an issue. The motor is a 6-cyilinder Perkins diesel with a mechanical fuel pump. Any suggestions on what to troubleshoot?
If it’s a rotary pump, it’s very possible that the head and rotor is worn... and when it gets warm the metal expands and won’t pump enough to start the engine.. Take a picture of the pump and post it ..
Interesting. I always thought the old timberjacks ran cummins 6bt. Never saw one with a Perkins
The motor is a perkins 1006-6T with a CAV injection pump. here is a picture of the engine. I'm guessing this would be considered a rotory pump, as the injection lines are distributed around the circumference of the pump, and not in-line like other injection pumps.
Puffie, u r correct..
That looks like a blast to remove.
I think it’s all done w timing pins and the whole front cover has to be removed to get to the pump bolts.. they come in thru the “back side”. Have a look at the pump hold down bolts(3).. no heads, just threads.. If u don’t know how to do it.. you’ll need a manual..
All the TJ forwarders I've looked at over the years had the Perkins. The machines were built either in Canada or Finland as I recall. You almost need an engineering degree to operate one of those machines. The last of the skidders that I worked on had John Deere engines.
Forget operating it, you need to be an multi-disciplined engineer just to do maintenance on this guy! The electronic relay logic and the hydraulic circuits on it are... interesting, to say the least. We were fortunate enough that we have the full set of manuals for it, so we have a fighting chance with keeping it going.
The test for a worn head and rotor is to cool the injection pump, and see if it starts better when hot. Dumping cold water on a hot injection pump will also seize the head and rotor and break the drive shaft if you're unlucky. When it's hot and won't restart, trickle some lukewarm water on the pump slowly for a couple minutes, then cross your fingers. Or bring a fan and cool it for several minutes to see if it starts.