A Few Questions

Russ Knight

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Perry, FL
Seems my rear axles are very noisy, especially when decelerating. Is this normal? Also, what temperatures should the hubs run after driving a bit? Last, what engine oil pressure and coolant temp is normal once the vehicle is warmed up to operating temp?

Thank you.
 

Elijah95

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Location
Georgia
My hubs average 145+, and once you get up to temp they along with your axles will “howl”. The hotter it gets, the more the noise. Especially driving near non-stop from cali to georgia mine were LOUD.

Since you just purchased this truck, I’d highly advise changing all 6 hubs gear oil, and properly filling to Halfway level. Also check differentials to insure they’re not under/overfilled, as mine were GROSSLY overfilled and actually blew oil out onto the back of the cab on an extended drive through the vent tubes.

Change your transfer case oil, it uses 15w40 diesel oil. Do not put gear oil in it. IIRC it’s < 3 gallons.

Lastly, coolant temp should be between 185-195, fan kicks on around 210+-. Whatever you do, do not overheat the C12, it will crack a head in a heartbeat! The oil pressure will be around 10-15psi hot idle and 40-59 psi under load at high rpm per the Caterpillar manual specs. My truck personally runs 8psi indicated on the gauge at idle and 30 going down the road BUT the gauge is inaccurate and if you check the oil pressure via the TIM Behind your dash, my pressure is actually 12 at hot idle and 47 going down the road.


Sent from my iPhone using Tapatalk
 

Russ Knight

Well-known member
Steel Soldiers Supporter
970
669
93
Location
Perry, FL
My hubs average 145+, and once you get up to temp they along with your axles will “howl”. The hotter it gets, the more the noise. Especially driving near non-stop from cali to georgia mine were LOUD.

Since you just purchased this truck, I’d highly advise changing all 6 hubs gear oil, and properly filling to Halfway level. Also check differentials to insure they’re not under/overfilled, as mine were GROSSLY overfilled and actually blew oil out onto the back of the cab on an extended drive through the vent tubes.

Change your transfer case oil, it uses 15w40 diesel oil. Do not put gear oil in it. IIRC it’s < 3 gallons.

Lastly, coolant temp should be between 185-195, fan kicks on around 210+-. Whatever you do, do not overheat the C12, it will crack a head in a heartbeat! The oil pressure will be around 10-15psi hot idle and 40-59 psi under load at high rpm per the Caterpillar manual specs. My truck personally runs 8psi indicated on the gauge at idle and 30 going down the road BUT the gauge is inaccurate and if you check the oil pressure via the TIM Behind your dash, my pressure is actually 12 at hot idle and 47 going down the road.


Sent from my iPhone using Tapatalk
Thank you very much!!!
 

Elijah95

Well-known member
Steel Soldiers Supporter
1,132
793
113
Location
Georgia
Okay, I’d check fuses next I’m not sure which one it is, and also go under hood and remove the TIM box located high on firewall. It may be toast and you can confirm by removing and disassembling to see if the board inside is smoked


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