6. SERVICING

[1] HYDRAULIC PUMP (THREE POINT HITCH HYDRAULIC SYSTEM)

Housing Bore (Depth of Scratch)

1.Check for the scratch on the interior surface of the housing caused by the gear.

2.If the scratch reaches more than half the area of the interior surface of the housing, replace at pump assembly.

3.Measure the housing I.D. where the interior surface is not scratched, and measure the housing I.D. where the interior surface is scratched.

4.If the valves obtained in the two determinations differ by more than the allowable limit, replace the hydraulic pump as a unit.

(Reference)

•Use a cylinder gauge to measure the housing I.D.

9Y1211121HYS0021US0

Clearance between Bushing and Gear Shaft

1.Measure the gear shaft O.D. with and outside micrometer.

2.Measure the bushing I.D. with and inside micrometer or cylinder gauge, and calculate the clearance.

3.If the clearance exceeds the allowable limit, replace the gear shaft and the bushings as a unit. 9Y1211121HYS0022US0

Side Plate Thickness

1.Measure the side plate thickness with an outside micrometer.

2.If the thickness is less than the allowable limit, replace it.

Hydraulic Cylinder

Hydraulic Cylinder Bore

1.Check the cylinder internal surface for scoring or damage.

2.Measure the cylinder I.D. with a cylinder gauge.

3.If the measurement exceeds the allowable limit, replace. 9Y1211121HYS0024US0

Clearance between Hydraulic Arm Shaft and Bushing

1.Measurement the hydraulic arm shaft O.D. with an outside micrometer.

2.Measurement the bushing I.D. with a cylinder gauge or inside micrometer.

3.If the clearance exceeds the allowable limit. replace.

Operating Pressure of Cylinder Safety Valve

1.Attach the cylinder safety valve to injection nozzle tester with a safety valve setting adaptor.

2.Measurement the operating pressure of the cylinder safety valve.

3.If the operating pressure is not within the factory specifications, adjust by turning the adjusting screw (1).

4.After adjustment, tighten the lock nut (2) firmly. NOTE

•Use specified transmission fluid (See page G-9) to test the operating pressure of the cylinder safety valve.