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Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 1169
Experience:  Technican turned service manager with multiple lines of equipment and rental units.
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I have an E120B Caterpillar excavator that we got

Customer Question

I have an E120B Caterpillar excavator that we got stuck in a creek. The water and mud were up to the floor of the cab. After getting unstuck all of the hydraulics except for the tracks are functioning normally. The tracks are running slow and don't have the power to steer unless we put the bucket under a strain by closing it all the way and holding it there. When we do this the tracks operate normally. When switching the travel speed selector between low and hi there is only a minor difference in speed unless the bucket is closed all the way and held there.The center swivel was rebuilt about about 30 hours ago.
Submitted: 2 years ago.
Category: Construction and Road Equipment
Expert:  catmastertech replied 2 years ago.
Hello, This sounds like the straight travel valve section is not working. This section is used to split the flows from both pumps during implement use to one pump flow for travel. When you bottom a function this shifts the section and your flow is split between the implement and travel. Have you tried bottoming other functions? What is happening to the swing when this happens?Have you checked pressures? Do you have multiple gauges to test pressures?What are the cycle times for the implement functions?

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