Bush Hog 2165 manual Troubleshooting

Troubleshooting (Continued)

Problem	Cause		Correction
Unable to push valve	Paint on valve spool; sticking		Clean valve spool. Binding is usually
spool in	valve spool or scored valve		caused from an overtightened 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. Instead,
			the plug and fitting should be removed
			from valve body and be reconnected,
			using a new O-ring. Do not apply
			excessive pressure on mounting bolts.
			The rods should be torqued to 30 ft. lbs.
			Never force spool.
	Oil leakage past spool seal into		Remove cap. If it contains oil replace spool
	spool cap		seal O-rings. Check O-ring retainer to be
			sure it is flat. If it has been “belled” check
			for restriction from outlet to reservoir of
			valve which would cause excessive back
			pressure. If supply and return lines are
			reversed, pressure on low pressure / return
			side of valve will cause problem.
			Make sure hoses are connected correctly
			at bulkhead connection on backhoe.
	Bent spool		Replace with new spool section.
	Foreign particles		Clean system and valve.
	Misalignment of control handle		Check linkage for binding condition.
	linkage
Spring centered spools	Paint on valve spool; sticking		Clean valve spool. Binding is usually
do not return to neutral	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.
			Instead, the plug and fitting should be
			removed from valve body and be
			reconnected, using a new O-ring. Do
			not apply excessive pressure on
			mounting bolts. The rods should be
			torqued to 30 ft. lbs. Never force spool.
	Oil leakage past spool seal into		Remove cap. If it contains oil replace spool
	spool cap		seal O-rings. Check O-ring retainer to be
			sure it is flat. If it has been “belled” check
			for restriction from outlet to reservoir of
			valve which would cause excessive back
			pressure. If supply and return lines are
			reversed, pressure on low pressure / return
			side of valve will cause problem.
			Make sure hoses are connected correctly
			at bulkhead connection on backhoe.
	Broken return springs		Replace springs.
	Bent spool		Replace with new spool section.
	Foreign particles		Clean system and valve.
	Misalignment of control handle		Check linkage for binding condition.
	linkage
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