Stabilizer Pads - 765H, 865H and 965H
The backhoe is supplied with
Figure 10
Hydraulic Trouble Shooting
The trouble shooting material presented in this sec- tion is offered as a guide to diagnosing probable caus- es and remedies for general operational problems. Match your problem with the typical problem exam- ples given, and note the numbers given for the possi- ble cause. These numbers correspond with the possi- ble cause and correction paragraphs that follow.
NOTE: When using the following chart, if it is decided that an overhaul of components or pressure adjust- ments are necessary to correct malfunctioning, it is recommended that your dealer make these repairs. He is equipped to do this work.
WARNING 
Escaping hydraulic / diesel fluid under pressure can penetrate the skin causing serious injury.
Do not use your hand to check for leaks. Use a piece of cardboard or paper to check for leaks.
Stop engine and relieve pressure before connect- ing or disconnecting lines.
Tighten all connections before starting engine or pressurizing lines.
If any liquid is injected into the skin, obtain med- ical attention immediately or gangrene may result.
Problems and Possible Causes
A. Machine fails to operate when started initially - 1, 2, 5, 7, 16, 24
B. Machine loses power after operating satisfactorily initially - 1, 8, 10, 14, 16, 24
C. Loss of power in lift or crowd cylinder, but other cylinders function properly - 23, 25, 30
Problems and Possible Causes, Continued
D. Loss of power in any one cylinder including lift and crowd - 8, 9, 10, 11, 12, 13, 23, 25, 26
E. Loss of power in swing cylinders, but other cylin- ders functioning properly - 8, 9, 10, 11, 12, 13, 23, 24, 26
F. Maximum swing action cannot be obtained - 12, 15
G. Slow operation of machine (lack of power) all cylinders - 1, 4, 6, 14, 16, 24
H. Spongy or jerking action of cylinders and/or noisy operation - 1, 3, 4, 5
I.Lift, crowd or bucket cylinders drop under load when control spools shifted from neutral - 28, 30
J.Load drops or settles - 8, 10, 13, 26, 28
K.Leaky cylinders - 10, 11, 12, 13
L.Leaky valve - 8, 16, 17, 29
M.Sticky valve spool - 17, 20, 21, 22
N.Unable to push valve spool in - 17, 18, 20, 21, 22
O.Spring centered spools do not return to neutral - 17, 18, 19, 20, 21, 22
Causes and Corrections
1.Low oil supply in reservoir - fill to proper level.
2.No oil supply to machine - oil is not being diverted from the prime mover hydraulic system. Be sure that the proper controls are actuated on the prime mover.
3.Air in system - bleed all circuits of air by operating machine at maximum oil flow and through full movements.
4.Oil viscosity too heavy, or oil is not at operating temperature - use recommended hydraulic fluid. Run machine until oil reaches operating temperature.
5.Pump not running - check pump drive to be sure it is engaged.
6.Insufficient pumping - advance engine throttle.
7.Improper hose connection - IMPORTANT: Be sure inlet and return hoses are hooked up correctly. Improper
8.Loose oil line connections, leaks in line or broken lines - tighten all hose connections and replace any damaged
9.Restrictions in oil lines - check and replace any damaged hoses and lines. Check for pinched hoses.
10.Oil is bypassing cylinder piston, scored piston, worn piston packing, or defective piston assembly - replace or rebuild the cylinder; replace damaged parts.
11.Scored piston rods and worn rod guides in cylinder - replace or rebuild the cylinder; replace damaged parts.
Continued
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