Land Pride BH3512 manual Table of Contents, Troubleshooting, Problem

Table of Contents

Section 6: Troubleshooting

Land Pride

Problem	Cause	Solution
Slow operation and poor	Engine speed too low.	Adjust RPM’s.
Hydraulic System
	Defective pump.	Check pressure or replace.
performance
	Load too heavy.	Check line pressure.
	Faulty main relief valve.	Clean or replace main relief valve.
	Internal valve crack.	Replace valve section.
	Suction line filter plugged.	Clean.
	Oil too heavy for cold weather use.	Replace with lighter oil.
	Power supply may not be plumbing	Use a flow meter to check out whether 4-8 GPM flow rate
	enough oil.	is being achieved.
	Low oil level.	Add oil.
	Pressure line restricted.	Check for obstruction.
	Collapsed suction line.	Check for damage.
	Valve spool not at full stroke.	Check movement and linkage.
Backhoe does not hold	Cylinder seals leaking.	Replace seals.
up load
	Valve spool leaking.	Replace seals.
	Oil bypassing valve spool.	Replace valve bank.
Load drops when valve	Dirt in load check valve.	Disassemble and clean.
spool moved from
neutral
Excess oil heat	Damaged or worn pump.	Repair or replace.
	Too fast of an engine speed.	Reduce throttle.
	Main relief bypass valve improperly	Check relief setting.
	set.
	Draft control lever not all the way	Position correctly.
	down.
Oil leakage	Valve spool seals.	Replace seals.
	Loose hose fittings.	Tighten just enough to stop leakage.
	Broken oil line.	Replace hose or line.
Independent Hydraulic	Improperly set relief valve.	Set relief at 1400 PSI.
system pump failure
Independent Hydraulic	Suction line filter plugged.	Clean filter.
system pump Noisy
	Oil too heavy.	Use a lighter oil.
Jerky or erratic action	Air in system.	Check for loose connections and/or cycle all valves to
		remove air.
	Wrong type of oil.	Check tractor manual. For Independent Hydraulic System
		use Type A non-foaming hydraulic oil.
	Foamy oil.	Check tractor manual. For Independent Hydraulic System,
		use a Type A non-foaming hydraulic oil.
Blown Return Valve	Improperly connected.	Make sure all connections are as shown in the assembly
		section of this manual.

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