Land Pride BH3512 manual Troubleshooting, Table of Contents

Land Pride Table of Contents

Section 6: Troubleshooting

Problem	Cause	Solution
Sticking plungers in	Excessively high oil temperature.	Eliminate restrictions in pipe lines and filtering system.
Hydraulic Valve
	Dirt in oil.	Change oil-clean system.
	Pipe fittings too tight.	Check torque.
	Valve warped from mounting.	Loosen valve and check.
	Excessively high pressure in valve	Check with gauge on inlet and cylinder lines.
	Handle or linkage binding.	Free up linkage.
	Plunger bent.	Replace valve or section.
	Return spring damaged.	Replace faulty parts.
	Spring or detent cap binding.	Loosen cap, re-center and re-tighten.
	Valve not at thermal equilibrium.	Let system warm up.
Leaking Seals in	Paint on or under seal.	Remove and clean.
Hydraulic Valve
	Excessive back pressure.	Open or enlarge line to reservoir.
	Dirt under seal.	Remove and clean.
	Scored plunger.	Replace valve or section.
	Loose seal plates.	Clean and tighten.
	Cut or scored seal.	Replace faulty parts.
Unable to move plunger	Dirt in valve.	Clean and flush out.
in Hydraulic Valve
	Plunger cap full of oil.	Replace seals.
	Bind in linkage.	Free up linkage.
Blown or leaking O-ring	Improperly connected.	Replace O-Ring seals. Make sure all connections are as
seals between valve sec-		shown in the assembly section of this manual.
tions in Hydraulic Valve
	Return line was replaced with high	Replace O-Ring seals. Remove high pressure hose and
	pressure hose.	replace it with correct low pressure hose.
	Valve used in power beyond applica-	Replace O-Ring seals. Install power beyond sleeve as
	tion without installation of power	shown in assembly section of this manual.
	beyond sleeve.
Can’t get pressure in	Poppet stuck open or dirt under	Check for foreign matter between poppets and their mat-
Relief Valve	seat.	ing members. Members must slide freely.
Erratic pressure in Relief	Pilot poppet seat damaged. Poppet	Remove and clean dirt out. If parts are damaged, replace
Valve	sticking in relief valve housing.	complete relief valve.
Pressure setting not	Wear due to dirt. Locknut and	See “How to Set Pressure”.
correct in Relief Valve	adjustment screw loose.	Check seats for scratches, nicks or other marks. Replace
		valve if damaged.
Relief Valve leaks	Damaged seats, worn O-Rings,	Replace worn or damaged O-Rings and back up rings.
	parts sticking due to dirt.	Inspect for free movement of components, check seat for
		scratches, nicks or other marks. Replace complete relief if
		metal parts are damaged.
Backhoe does not	Low oil supply.	Add oil.
operate
	Hoses not properly connected.	Check hose connections.
	Worn or damaged pump.	Replace or repair pump.
	Broken line.	Check for leaks. Replace line.

7/14/08 BH3512 Backhoes 340-131M 27