if your nail catches.
b) Flaws can be found on the face of the bushing and gets very rough to the feel
if your nail catches.
c) The inner sliding surface and face have foreign matters sticked.
In most case, above troubles on the bushing are caused by contamination of
hydraulic oil. If any trouble occurs, flush the whole circuit and change oil. On rare
occasions, however, the bushing may get troubles due to overload of safety valve,
cavitation, too high oil temperature or too low oil viscosity. If in these cases the gear
shaft or gear face get rough or worn excessively, replace the gears as well as the
bushings. The service limit of the bushing is as follows: (See Fig.9-14)
Inner diameter: 19.123mm;
Overall length: 26.411mm.
(3) Gear inspection
As long as clean hydraulic oil is used, the gear shaft and gear face will not get
damaged. If the gear shaft and gear face feel rough with your nail or flaws in gear face
are found, or the gear surface is very unevenly worn, replace the gear with new one.
When the gear surface is worm or discolored, it indicates that the bushing and pump
body also get troubles and need to be inspected. The gear shaft diameter limit is
18.935mm (See Fig.9-15).
Fig.9-15 Fig.9-16
(4) Seal inspection
a) Oil seal(14) (See Fig.9-18 & 9-19)
Sealing lip
Inside of the pump
Dust proof lip
Outside of the pump
-83-
To Next Page
Loading...
