5020, 6030 cab heater hoses

Big Jugs

Member
Does anyone have some pics or illustrations of where the hoses for the cab heater need to go to on these tractors to get the flow from?
 

Cab heater is supplied with the hottest and highest pressure coolant. The heater core return line is connected to the lowest pressure point in the system.
 
Here's the best pic I have in my computer, but maybe it will help. One line comes directly off the top of the water pump. You can just barely make out the elbow in the photo. The other line comes from the top of the water jacket. 5020 should be quite similar.



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(quoted from post at 17:46:40 11/10/14) Here's the best pic I have in my computer, but maybe it will help. One line comes directly off the top of the water pump. You can just barely make out the elbow in the photo. The other line comes from the top of the water jacket. 5020 should be quite similar.


Hot coolant supply to the heater core is ideal. I'm not certain however if the cool return line is connected to the inlet/suction side of the water pump ?
 
Every cab I have pulled, the principal is always the same regarding the plumbing. Yes the manifolds are different, but in general they work quite similar. The return dumps directly into the top of the water pump. Cab tractors have a short pipe on top of the water pump with an elbow and nipple. Open station tractors will have a pipe plug in that hole instead. The supply typically comes from your hottest coolant. On the 531 this is the head coolant temp, which is tapped in at the water manifold. In the case of the 404, it is slightly different for whatever reason. Those motors use a line coming from the block. If you are not getting enough heat, I would say either you have a restriction in the supply somewhere or your thermostats aren't hot enough, or the plumbing is wrong.
 

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