erradic hyd lift operation removed top cove long leaver going down to hyd pump wobbles on shaft on lift leaver so does draft and position leaver how tight are these suppose to be
 
Most lift 'eratic' lift problems are caused by a worn cam follower pin. You really need the I&T FO4 manual to adjust the linkage. Or, get Zane Shermans jig and instructions.
Zanes site
 
replaced cam follower pin to correct eratic hyd problem had to lossen 4 bolts on lever move back helped problem with erratic lift problem will now lift but i am assumming that if it will not stay up i need to replace piston and rings the shop manusl has been a good tool
 

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