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It never ceases to amaze me we change the hyd oil on these trucks at 2000hrs, sometimes 4000hrs with 10W oil as per Cat's recommendation (oil samples generally show it is still perfectly fine at drain time though). The oil will generally hit 100-110c every 20 minutes (avg haul cycle) keeping a 400 tonne of truck under control 22hrs a day, 7 days a week. What is a major problem, is when a hyd oil cooler fails, and lets coolant in the hyd system, it swells the brake material, causing drag. I've seen temps around 148 c when this happens!! Operators not using the automatic retarding system are the biggest cause of warped brake dics though. Man will never be as precise as a computer!

[QUOTE="askinner, post: 13723, member: 91"] It never ceases to amaze me we change the hyd oil on these trucks at 2000hrs, sometimes 4000hrs with 10W oil as per Cat's recommendation (oil samples generally show it is still perfectly fine at drain time though). The oil will generally hit 100-110c every 20 minutes (avg haul cycle) keeping a 400 tonne of truck under control 22hrs a day, 7 days a week. What is a major problem, is when a hyd oil cooler fails, and lets coolant in the hyd system, it swells the brake material, causing drag. I've seen temps around 148 c when this happens!! Operators not using the automatic retarding system are the biggest cause of warped brake dics though. Man will never be as precise as a computer! [/QUOTE]

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