Bush Hog CBH80, CBH60, CBH70 manual Troubleshooting

Troubleshooting (Continued)
	Problem	Cause		Correction
	Lift, crowd or bucket	Problems involving the control		Dirt and shreds of packing material are
	cylinders drop under load	valve (cont.)		the usual causes of valve malfunction.
	when control spools			Be sure the reservoir oil supply is kept
	shifted from neutral			clean and only factory supplied packing
				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 replace
		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.
	Leaky cylinders	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.
	Leaky valve	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.
		Excessive back pressure		Relieve condition. Restriction may be
				from outlet to reservoir.
		Paint on valve spool; sticking		Clean valve spool. Binding is usually
		valve spool or scored valve		caused from an over tightened plug,
		spool		mounting bolt, fitting in valve body or
				tie rod bolt. If a plug or fitting in the
				valve body is leaking, do not overtighten
				in an effort to stop leak. This will distort
				body casting and cause spools to bind.
				(cont.)
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