Manitowoc Published 05-26-17, Control # 238-02 2-15
MLC165-1 SERVICE/MAINTENANCE MANUAL HYDRAULIC SYSTEM
Hydraulic System Specifications
Table 2-1 Hydraulic Specifications
Function Direction
Valve/Pump
Port
System
Pressure 1
1
psi (bar)
System
Pressure 2
psi (bar)
Pilot Pressure
psi (bar)
Speed
3
rpm
Drum 1 Up Valve B6 5,076 (350)
NA
507 (35) 53
Down Valve A6 1,450 (100) 50
Drum 2 Up Valve A2 5,076 (350) 53
Down Valve B2 1,450 (100) 50
Drum 3 Up Valve A1 5,076 (350)
25
Down Valve B1 1,450 (100)
Drum 4 Up Valve B5 5,076 (350)
25
Down Valve A5 1,450 (100)
Right Crawler Forward Valve A3
5,076 (350)
10 at
Tumbler
Reverse Valve B3
Left Crawler Forward Valve A4
Reverse Valve B4
Swing Left Pump B
5,221 (360)
363 (25)
4
2.5
Right Pump A
High Pressure
Accessory System
5
NA NA
350 (24) to
3,626 (250)
600 (41) to
3,400 (234)
2, 7, 8
NA NA
Assembly Cylinder 600 (41) to
1,800 (124)
2, 7, 8
Carbody Control
System
6
NA 3,626 (250)
NOTES
NA Not Applicable.
1 Controlled by multi-function valves in each pump. Max values given. Pressures are load dependent.
2 Controlled by crane’s programmable controller.
3 Speeds based on engine at high idle, no load (no rope on drums), and handles moved fully forward or back. Speeds
can very plus or minus 5%.
4 Swing charge pressure (also called boost pressure).
5 Mast raising cylinder, boom butt pin cylinder, counterweight lift cylinders, cab tilt cylinder, counterweight pin puller
cylinders.
6 Jack cylinders and carbody pin puller cylinders.
7 During free fall: 1,000 psi (69 bar) at 100% slip to 250 psi (17 bar) at 25% slip.
8 500 - 900 psi (34 to 62 bar) while lowering the mast over the assist cylinders (control system synchronizes mast
cylinders and hauling in on the boom hoist).
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