Mark's magneto repair service drivers#
Mark's magneto repair service series#

Still the pony motor once started was running on 1 cylinder but then we stripped the magneto again and saw the offset shaft which caused the problem & then the condenser being the main cuplprit so check these as its normally the magneto or fuel you will have the problem with.

One plug was hot the other cold but we found the problem in the magneto & points. You will see the timing marks once the magneto is out. We got spark in the magneto and set the timing OK (bit hard to see timing marks so make sure you have a strong torch to see and try to mark if you dismantle). In our case it we had one spark plug good and the other cold- tried leads & switching spark plugs as we didn't have any spares at the time (this machine was in the bush). If you have problems with spark check each of the 2 plugs once the motor starts but also start the pony with spark plug arcing against metal to check for spark. With us we had intermitten spark problems and it turned out to be the magneto shaft not centred & the condenser which although we gor spark we only just got it. Makde sure you have fuel flowing thru the fuel lines to the carb bowl. Clean the bowl & blow the air thru the carb line and bowl if sitting. The D4 can give you problems especially when sitting a long time. If access to air line take the plugs out both sidse & blow air when you crack 1/4 turn taps to release water etc.

Mark's magneto repair service drivers#

Drain plug is on the right side if in the drivers seat. Check dip stick & use SAE30 grade oil to replace or top off. Note in the above picture: the tap at the bottom turn 1/4 turn only to release any water if sitting on both sides of the pony motor. The older D-4s have the same carb kit as a John Deere JD 720 and 730 pony motor The Pony motor carb kit: CAT part number or better yet the Zenith carb number should be a Zenith K2067 kit. The Pony motor started the machine then the diesel engine kicked in once primed by the petrol -powered motor. The smaller D2 was a bit underpowered for the weight but the D4 was another machine and solid as. The Caterpillar Company continued to build new D4s right up till now and they are a great machine.

Mark's magneto repair service series#

The D4 actually started around 1937 with a G4 Series then evolved into the 7U Series of the 1940s and 1950s.