Manitowoc 18000 Service Maintenance Manual

Reference Only
HYDRAULIC SYSTEM 18000 SERIVCE/MAINTENANCE MANUAL
2-40 Published 12-05-17, Control # 035-23
Counterbalance Valves Adjustment
Each jacking cylinder has a single counterbalance valve at
the piston end of the cylinder. The retract adjusting screw at
the valve provides adjustment for each jacking cylinder load
support. The extend adjusting screw allows cylinders to be
adjusted for uniform operation on level ground.
Counterbalance valves are pre-adjusted at the factory, but
are not calibrated. Adjust counterbalance valves with a
closed end wrench and hex wrench. To avoid over-adjusting
the cylinders, use a hex wrench as a guide and never turn a
counterbalance valve more than 1/2 turn in either direction.
To adjust a counterbalance valve:
• Loosen the adjusting lock nut.
• Rotate counterbalance adjusting screw 1/2 turn
clockwise (in) to lower holding pressure.
• Rotate counterbalance adjusting screw 1/2 turn counter-
clockwise (out) to raise holding pressure.
• While holding counterbalance-adjusting screw with hex
wrench, tighten lock nut.
• Recheck cylinder(s) for correct load support and uniform
operation.
P1693b
P1693a
1
2
3
4
5
8
7
6
Item Description Item Description
1 Right Mast Cylinder 5 Mast Cylinder Extend Valve
2 Mast Cylinder Counterbalance Extend Valve 6 Rotating Bed Jack
3 Mast Cylinder Counterbalance Retract Valve 7 Rotating Bed Jack Extend Counterbalance Valve
4 Mast Cylinder Retract Valve 8 Rotating Bed Jack Retract Counterbalance Valve
18CSM10-104

Manitowoc 18000 Specifications

General

Brand	Manitowoc
Model	18000
Category	Construction Equipment
Language	English