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.
#1954 d2 dozer 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. The D4 actually started around 1937 with a G4 Series then evolved into the 7U Series of the 1940s and 1950s.
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