My excavator blade cylinder is drifting. There are several possible causes. What did mine turn out to be? The most difficult one, of course! The swivel joint, also call a rotary manifold or rotary union. I'd say this is the coolest hydraulic component I've ever seen.

Clarification on this video:    • Clarification on Swivel Joint Video  

My cap and plug set: https://amzn.to/3TPFSQO. (A nice set, but not enough to do this job. 20 hoses is a lot of caps and plugs.

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00:00 Intro
0:39 Testing blade cylinder
5:12 Cylinder test explained
8:12 Re-install blade cylinder
8:37 Hydraulic system explained
11:16 Look at hydraulic components on the excavator
12:51 Testing control cable
14:09 How to test swivel joint
14:39 Testing swivel joint
17:09 Remove swivel joint
24:34 Coyotes!
27:37 Rebuild swivel joint
36:30 Re-install swivel joint
37:02 Confirming repair
38:26 Using excavator!
41:38 Hydraulics on other equipment
44:55 Outro