A: Yes. Rev 4.0 was released in 2024 but only for the 1600 model. Rev 3.2 is the final version for the 1200.
Mid-July is when most HyRoller 1200 units fail. Here is a checklist lifted directly from the Service Schedule B in the manual: woodchuck hyroller 1200 service manual
To adjust, loosen the locknut on the relief valve, turn the adjustment screw clockwise to increase pressure (or counter-clockwise to decrease), and tighten the locknut. Bleeding Air from the Hydraulic System A: Yes
Despite extensive searching, an official service manual for the Woodchuck HYROLLER 1200 is not readily available in free online PDF format. However, there are several effective strategies you can use to obtain one: Mid-July is when most HyRoller 1200 units fail
According to an NHTSA Customer Service Notice (CSN 551):
Unlike many chipper manuals that treat hydraulics as an afterthought, the HyRoller 1200 manual provides detailed schematics and troubleshooting flowcharts for the feed wheel drive system. It includes: