Bush Hog 2165 manual Troubleshooting Continued, Problem, Cause, Correction

Troubleshooting (Continued)

Problem	Cause	Correction
Loss of power in any one	Worn or damaged rod seals on	Repack cylinder. Rebuild cylinder,
cylinder, including lift	cylinder; external leaks	replacing damaged parts as necessary.
and crowd
	Spool not moved to full stroke	Check spool travel - should be .26”
		either way, or a total of .52”.
	Overload relief valve in the control	Clean relief carefully but do not disturb
	valve stuck open or malfunctioning	its pressure setting as it cannot be field
		calibrated, or replace cartridge.
	Worn control valve	Replace the control valve.
Loss of power in swing	Loose oil line connections,	Tighten all hose connections and
cylinders, but other	leaks in line or broken lines	replace any damaged O-rings at
cylinders functioning		leaking O-ring fittings. Check and
properly.		replace any damaged hoses and lines.
	Restrictions in oil lines	Check and replace any damaged hoses
		and lines. Check for pinched hoses.
	Oil is bypassing cylinder piston,	Replace or rebuild the cylinder; replace
	scored piston, worn piston	damaged parts.
	packing, or defective piston
	assembly
	Scored piston rods and worn	Replace or rebuild the cylinder; replace
	guides in cylinder	damaged parts.
	Bent piston rod in cylinder	Replace or rebuild the cylinder; replace
		damaged parts.
	Worn or damaged rod seals on	Repack cylinder. Rebuild cylinder,
	cylinder; external leaks	replacing damaged parts as necessary.
	Spool not moved to full stroke	Check spool travel - should be .26”
		either way, or a total of .52”.
	Relief valve setting in backhoe	Relief pressure will have to be checked
	control valve too low or defective	and corrections made. Backhoe
		system pressure is 2400 PSI. Relief
		valve may need cleaning and over
		hauling, or entire cartridge must be
		replaced.
	Worn control valve	Replace the control valve.
Maximum swing action	Bent piston rod in cylinder	Replace or rebuild the cylinder; replace
cannot be obtained		damaged parts.
	Something jamming the swing	Remove interference.
	linkage
Slow operation of machine
(lack of power) all cylinders	Low oil supply in reservoir	Fill to proper level.
	Oil viscosity too heavy, or oil	Use recommended hydraulic fluid. Run
	is not at operating temperature	machine until oil reaches operating
		temperature.
	Insufficient pumping	Advance engine throttle.
	Diverter valve on prime mover	Diverter valve may need rebuilding or
	leaking externally or bypassing	replacing.
	oil internally through valve to
	reservoir
	Excessive back pressure	Relieve condition. Restriction may be
		from outlet to reservoir.

19