Bush Hog 2165 manual Load drops or settles

Troubleshooting (Continued)

Problem	Cause	Correction
Slow operation of machine	Relief valve setting in backhoe	Relief pressure will have to be checked
(lack of power) all cylinders	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.
Spongy or jerking action	Low oil supply in reservoir	Fill to proper level.
of cylinders and/or noisy
operation	Air in system	Bleed all circuits of air by operating
		machine at maximum oil flow and
		through full movements.
	Oil viscosity too heavy, or	Use recommended hydralic fluid. Run
	oil is not at operating	machine until oil reaches operating
	temperature	temperature.
	Pump not running	Check pump drive to be sure it is
		engaged.
Lift, crowd or bucket	Damaged or worn spool	Replace spool end seals.
cylinders drop under load	seals
when control spools
shifted from neutral	Problems involving the control	This valve is a precision device and is
	valve	not intended for any extensive field
		adjustment or repair. Field replace-
		ment parts are limited to seal kits,
		cartridges, valve sections and tie rods.
		Replacement of these parts, the
		opening of check cavities and certain
		relief cavities to examine for trapped
		dirt, or resetting of the main relief valve
		with the use of good pressure gauge,
		should be referred to qualified service
		personnel.
		Dirt and shreds of packing material are
		the usual causes of valve malfunction.
		Be sure the reservoir oil supply is kept
		clean and only factory supplied
		packings are used in cylinder repair.
		Everything must be clean and free of
		dirt during the oil line removal and
		replacement, and during any cylinder
		work.
Load drops or settles	Loose oil line connections,	Tighten all hose connections and
	leaks in line or broken lines	replace any damaged O-rings at
		leaking O-ring fittings. Check and
		replace any damaged hoses and lines.
	Oil is bypassing cylinder piston,	Replace or rebuild the cylinder; replace
	scored piston, worn piston	damaged parts.
	packing, or defective piston
	assembly
	Worn or damaged rod seals on	Repack cylinder. Rebuild cylinder,
	cylinder; external leaks	replacing damaged parts as necessary.
	Worn control valve	Replace the control valve.
	Damaged or worn spool seals	Replace spool end seals.

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