SHOP MANUAL
HYDRAULIC
Ch 5 page 42 Ch 5 page 43
HYDRAULIC
The Steering Cylinders are located on each side of the articulation hinge.
Removal
Thoroughly clean the steering cylinder and the area around for any accumulated dirt.
Make sure that the steering lock is in position (Ref. Operation and Maintenance Handbook)
Place a container below the cylinder to catch any hydraulic fluid spilt during removal.
Mark each hydraulic line for proper location and plug lines as they are removed from cylinder.
Remove the screws and washers securing the cylinders pivot bolts. Disconnect lubrication lines if fitted.
Drive the pivot bolts down.
Carefully lift the steering cylinder out from the truck for exchange or overhaul. If the cylinder is exchanged,
save the connectors attached to the valve body.
Be aware of the risk of injury to people and equipment when handling heavy objects!
Installation
Check the condition of the connector seals, replace if necessary. Apply a light coat of oil to the hose fit-
ting seals. Install the connectors in cylinder body, and tighten.
Position the steering cylinder in the mounting brackets. Install the pivot bolts, with lubrication bore point-
ing down, by driving down from the top with a soft mallet.. Install expansion rings, securing screws and
washers etc. Make sure the assembly is centred. Tighten the screws to 380 Nm.
Connect lubrication lines if fitted.
Fill cylinder with hydraulic oil, and install hydraulic hoses. (For fluid type and specifications, refer to the
DOOSAN Operating & Maintenance Manual Chapter 6)
Control
Check that all connections are located in the same positions as before removal, and that all hoses are
correctly routed.
Perform startup test procedure. Ref. section: Startup test procedure.
Steering Cylinder
Steering cylinders: DA30 DA40
• Double acting
• Qty 2 2
• Cylinder diameter 100mm 115mm
• Piston diameter 63mm 70mm
• Stroke 515mm 550mm
• End cushion
WARNING
Figure 28
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