OPERATOR'S MANUAL MAINTENANCE

Section E - Hydraulics
Circuit Descriptions
Straight Line Travel
E-32 E-32
9803/9880-3
Straight Line Travel
For individual travel and boom circuits,
K Fig 9. ( T E-33).
To demonstrate the linear travel, both travel spools and
boom up spool have been selected, refer to individual
circuits.
Servo pressure enters the main control valve 14 at Pa1 to
select LH travel spool. This pressure is seen at the travel
pressure switch 51 and also selects the linear travel (1)
spool (LT1)
Servo pressure enters main control valve 14 at Pa6 to
select RH travel spool. The pressure is also seen at the
travel pressure switch 51 and also passes through the
selected LT1 spool to select linear travel (2) spool (LT2)
Servo pressure has entered the main control valve 14 at
Pa8 to select the boom up spool. This pressure is also
seen at the upper pressure switch 52 and passes through
LT2 to select liner travel spool (3) (LT3)
Oil from pump 1 enters the main control valve 14 at port P2
and is used at the boom 1 spool. This also passes over the
selected LT3 spool to supply the boom 2 spool. The oil
from both boom spools 1 and 2 merges and exits the main
control valve 14 at A8 to raise the boom.
Oil from pump 2 enters the main control valve 14 at port P1
and is available at the LH travel spool and the RH travel
spool via LT3.