Control Valve - Bucket Spool Shifted - New Holland LS140 Workshop Manual

6 5
3
4
CONTROL VALVE - BUCKET SPOOL
SHIFTED
Bucket Control Operation
Foot Controls
When the toe of the control pedal is pushed down, it
will shift the control valve spool in, dumping the buck-
et. When the heel of the control pedal is pushed
down, it will shift the control valve spool out curling
the bucket back.
Hand Controls
When the right control handle is pivoted up it will shift
the control valve spool in, dumping the bucket. When
the right control handle is pivoted down it will shift the
control valve spool out, curling the bucket back.
SECTION 35 - HYDRAULIC SYSTEM
2
1
1. Oil flows from the gear pump, 1, through pres-
2. When the bucket valve spool, 4, is pulled out, the
3. When the bucket valve spool, 4, is pushed in, the
4. When the bucket circuit is operated to maximum
5. The return oil from the opposite side of the cylin-
35-23
sure line, 2, to control valve, 3.
oil flows from the rear work port, 5, to the shaft
side of the bucket cylinder to curl the bucket
back.
oil flows from the front work port, 6, to the base
(piston) end of bucket cylinder to dump the buck-
et.
pressure or cylinders are bottomed, the main
system relief valve will relieve the high pressure
oil into the return oil galley in the control valve, re-
turning the oil to the reservoir.
der being pressured will return through the con-
trol valve to the reservoir.
Copyright © New Holland
9