Allmand Brothers Allmand 8.5 10 FT BACKHOE - Manual (Page 26)

26
MAINTENANCE
L
GENERAL MAINTENANCE
CONTROL VALVE
The hydraulic control valve maintenance in normally limited to replacement of
O-ring seals, cleaning and the replacement of valve sections or relief valve car-
tridges.
The most common cause of premature wear and malfunctioning of hydraulic
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 peen-
ing 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