Troubleshooting Challenge: Drill Rig’s Top Drive Drops Uncontrollably (.PDF Download)
Jan. 17, 2017
A 65-ft.-high drill rig, mounted on a freshwater barge, was allowing its top drive head to drop uncontrollably. The circuit controlling this function shows (see illustration) both a brake (counterbalance) valve and a hydraulically controlled mechanical brake on the hoist function. The systems’ power unit was mounted close to the deck, with its A and B line hoses going up to top drive’s hydraulic motor. The brake and shuttle valve were plumbed close to the motor, which lifted and lowered the drill drive head...
Register or Sign in below to download the full article in .PDF format, including high-resolution graphics and schematics when applicable.
Sponsored Recommendations
Sponsored Recommendations
May 15, 2024
March 13, 2024
March 13, 2024
March 13, 2024