Hydraulic Troubleshooting

MAINTENANCE

Hydraulic troubleshooting material presented in this section is offered as a guide to diagnosing probable causes and remedies for general operational problems.

Match your problem wiht the typical problem examples given in the possible cause column. These numbers correspond with the possible cause and correction paragraphs that follow.

NOTE: If, when using the following chart, it is decided that overhaul of components or pressure adjustment is necessary, it is recommended that your dealer make these repairs. He is equipped to do this work.

PROBLEM	POSSIBLE CAUSE

Machine fails to operate	1, 2, 5, 7, 15, 23
when initially started.

Machine looses power after	1, 8, 10, 15, 23
initially operating
satisfactorily.

Loss of power in lift or crowd	22, 24, 28
cylinder, but other cylinders
function properly

Loss of power in any one	8, 9, 10, 11, 12, 13, 22,
cylinder including lift and	23, 25
crowd

Loss of power or loss of	8, 9, 10, 11, 12, 13, 22,
cushioning action in swing	23, 25
cylinders, but other cylinders
function properly.

Maximum swing action	12, 14
cannot be obtained.

Slow operation of machine	1, 4, 6, 15, 23
(lack of power) all cylinders.

Spongy or jerky action of	1, 3, 4, 5
cylinders and/ or noisy
operation.

Lift crowd or bucket cylinders	26, 28
drop under load when lever
spools are shifted from
neutral.

Load drops or settles.	8, 10, 13, 25, 26

Leaky cylinders.	10, 11, 12, 13

Leaky valve.	8, 15, 16, 27

Sticky valve spool.	16, 19, 20, 21

Unable to push valve spool	16, 17, 20, 21
in.

Spring centered spools do not	16, 17, 18, 19, 20, 21
return to neutral.

	POSSIBLE CAUSE	CORRECTIVE ACTION

1	Low oil level in	Fill reservoir to proper
	reservoir.	level.

2	No oil supply to	Engage tractor PTO.
	machine.

3	Air in system.	Purge all circuits of air by
		operating all cylinders
		through full movements
		several times. Check oil in
		reservoir for foaming.
		Check all suction lines for
		leaks. Fill reservoir to
		correct level.

4	Oil viscosity too	Use recommended
	heavy or oil is not at	hydraulic fluid. Run
	operating	machine until it reaches
	temperature.	operating temperature.

5	Pump not running.	Check PTO to be sure it is
		engaged. Pump
		connected to PTO.

6	Insufficient pumping.	Advance engine throttle.

7	Improper hose	IMPORTANT: Be sure inlet
	connection.	and return hoses are
		hooked up correctly.
		Improper hookup will
		result in damage to
		backhoe valve.

8	Loose hydraulic	Tighten all hose
	connections, leaks	connections and replace
	in fittings or hoses.	all damaged o-rings at
		leaking o-ring fittings.
		Check and replace any
		damaged hoses.

9	Restriction in fittings	Check and replace any
	or hoses.	damaged hoses and
		fittings. Check for pinched
		hoses.

10	Oil is bypassing	Replace or rebuild
	cylinder piston.	cylinder. Replace
		damaged parts.

11	Scored piston rods	Replace or rebuild
	or worn rod guides	cylinder. Replace
	in cylinder.	damaged parts.

12	Bent piston rod in	Replace or rebuild
	cylinder	cylinder. Replace
		damaged parts

13	Worn or damaged	Re-pack cylinder. Rebuild
	rod seals on	cylinder replacing
	cylinder. External	damaged parts as
	leaks.	necessary.

14	Swing linkage	Remove interference.
	jammed.

MAINTENANCE

F-4139 01/11

Maintenance Section 3-5