Komatsu Galeo PC138US-8 Shop Manual page 280

SEN02553-01
Pump merge-divider function
When the travel lever is operated, detects the pilot pressure and judges if it is for straight-travel.
q
For straight-travel, a signal is sent to the pump merge-divider solenoid valve, dividing the pump delivery,
q
to improve travel performance.
Criterion of travel
Pattern
operation
Stop or travel at very low
speed
(All of following conditions
are satisfied)
1
• P1 = Min. 1.6 {16}
• P2 = Min. 1.6 {16}
• P3 = Min. 1.6 {16}
• P4 = Min. 1.6 {16}
2
3
Travel at normal speed
(One of following condi-
tions is satisfied)
• P1 = Min. 1.8 {18}
(*1)
• P2 = Min. 1.8 {18}
4
• P3 = Min. 1.8 {18}
• P4 = Min. 1.8 {18}
5
*1. If the work equipment etc. is operated in pattern 4, the pump merge-divider valve is set to the merge
mode of pattern 5. Even if the work equipment operation is stopped after the pump merge-divider valve
is set in pattern 5, the pump merge-divider valve is not returned to pattern 4.
P1: Left forward PPC pressure (MPa {kg/cm
P2: Right forward PPC pressure (MPa {kg/cm
P3: P1: Left reverse PPC pressure (MPa {kg/cm
P4: Right reverse PPC pressure (MPa {kg/cm
P5: Blade PPC pressure (MPa {kg/cm
22
10 Structure, function and maintenance standard
Criterion of steering
operation
Straight travel operation
(All of following conditions
are satisfied)
• P1 – P2 absolute value =
Max. 0.3 {3}
• P3 – P4 absolute value =
Max. 0.3 {3}
Steering operation
(One of following condi-
tions is satisfied)
• P1 – P2 = Min. 0.5 {5}
• P3 – P4 = Min. 0.5 {5}
2 })
2 })
})
2
})
2
})
2
Criterion of work equipment and
blade operation
(All of following conditions are satisfied)
• Work equipment is not operated (Work
equipment PPC pressure switch is
"OFF").
• Blade is not operated (P5 = Max. 0.3
{3}).
(One of following conditions is satisfied)
• Work equipment is operated (Work
equipment PPC pressure switch is
"ON").
• Blade is operated (P5 = Min. 0.5 {5}).
(All of following conditions are satisfied)
• Work equipment is not operated (Work
equipment PPC pressure switch is
"OFF").
• Blade is not operated deeply (P5 =
Max. 2.0 {20}).
• Pivot turn is not made.
Example) Right forward pivot turn (P1
= Max. 2.0 {20} or P2, P4 = Min. 0.5
{5})
(One of following conditions is satisfied)
• Work equipment is operated (Work
equipment PPC pressure switch is
"ON").
• Blade is operated deeply (P5 = Max.
2.2 {22})
• Pivot turn is made.
Example) Right forward pivot turn (P1
= Max. 2.2 {22} and P2, P4 = Max. 0.3
{3})
Merge-
divider
valve
Merge
Divide
Merge
Divide
Merge
PC138US, USLC-8