MAINTENANCE
LL
GENERAL MAINTENANCE
6749
1-22-96
CONTROL VALVE
The hydraulic control valve maintenance is normally limited to replace-
ment of O-ring seals, cleaning and the replacement of valve sections or relief
valve cartridges.
The most common cause of premature wear and malfunctioning of hy-
draulic system components is the ingress on contaminants and incorrect high
pressure inlet and low pressure return connections (cavitation).
Observe a high standard of cleanliness when doing valve maintenance.
Use clean oil and clean containers when adding oil for hydraulic purposes.
REPLACING BUCKET TOOTH POINTS
The bucket teeth are self-sharpening and require little attention: however,
the points on the bucket teeth shanks can be replaced when they become worn
or broken.
A tooth point can be removed from the welded tooth shank by hammering
at "A" on the tooth point or by driving a chisel at "B" just between the tooth point
box section and the tooth shank. Install the new point and anchor it to the tooth
by peening at the location shown.
CHANGING BUCKETS
TOOTH POINT
A
PEEN METAL
INTO SHANK RECESS
B
TOOTH SHANK
The bucket is connected to the dipper and bucket link with two cotter pin
style pins. To change buckets, remove the cotter pins and washers and then
remove the old bucket and position the new bucket in its place. Install the pivot
pins and secure with washers and cotter pins. Lubricate all bucket and bucket
link grease fittings before operating.
NOTE: Dipper Link must be installed with the longer end of the dipper link
with the pin containing the grease zerk at the dipper end and angled as
shown in the diagram.
BUCKET
BUCKET LINK
DIPPER LINK (ANGLED
UP)
LONGER END OF DIPPER LINK
DIPPER LINK (ANGLED
UP)
DIPPER
PIN WITH GREASE ZERK
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