Bradco 509 Návod k obsluze Strana 31

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MAINTENANCE AND SERVICE
8771 8-23-11-3
TOOTH POINT
TOOTH SHANK
BUCKET
PIN WITH GREASE ZERKS
CONTROL VALVE
The hydraulic control valve maintenance in normally limited to
replacement of O-ring seals, cleaning and the replacement of valve sec-
tions (Gresen) or relief valve cartridges.
To convert your monoblock valve from open center to either
closed center or power beyond, the optional plug #45938 must be
purchased and installed in your valve.
Remove plug #45921 from the end of your valve and install plug
#45938 inside port (approximately 1”) followed by the ttings and hose
from the existing return port. Install plug #45921 into the existing return
port for closed center or use this port as your power beyond.
The hydraulic control monoblock valve maintenance is normally
limited to replacement of O-ring seals, cleaning and the replacement of
relief valve cartridges.
The most common cause of premature wear and malfunction-
ing 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.
ROLL PIN
CHANGING BUCKETS
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 ttings before operating.
NOTE: Dipper Link must be installed with the with the pin containing the grease zerks
at the dipper end and angled as shown in the diagram.
DIPPER
DIPPER LINK
(ANGLED DOWN)
BUCKET LINK
DIPPER LINK
(ANGLED DOWN)
REPLACING BUCKET TOOTH POINTS
The bucket teeth are self-sharpening and re-
quire 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 removing the roll pin and sliding the
tooth point off of the shank. Install the new point and
secure in place with the roll pin.
EXISTING
RETURN
PORT
PLUG
#45921
PLUG
#45938
MOVE RETURN PORT FITTINGS
AND HOSE TO END OF VALVE
75475
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