Chapter 4: Maintenance
56 M47-17041-EN
Replace low pressure hydraulic hoses
Low pressure hoses are hoses that are normally subjected to pressures less than 20 bar (300 psi). Low
pressure hoses would be:
• Drain hoses
• Return hoses between system components and the reservoir
Replace high pressure hydraulic hoses
High pressure hoses are hoses that are normally subjected to pressures 20 bar (300 psi) and greater.
High pressure hoses would be:
• Supply hose between the HPS and hydraulic cylinder
• For frames with a J3-style crosshead, any supply hose between the HPS and the crosshead lift
cylinders and between the HPS and the crosshead lock cylinders
Oil type and quantity
The International Standards Organization (ISO) viscosity designation for oil appropriate to use in the
reservoir is ISO VG 32. An ISO VG 32 grade oil was used to fill the hydraulic reservoir before the
equipment left the factory. As it becomes necessary to add to or replace the oil in the reservoir, use an
ISO VG 32 grade oil. Many brand names contain this number. In general look for oils with the following
properties: good demulsibility; low air entrainment; low pour point; and additives that protect against rust,
corrosion, accelerated pump wear, foaming, and oxidation.
Approximate reservoir capacities for the various models of LX frames can be found in Table 11.
Table 11. Approximate capacity of HPS reservoir.
Frame Model Reservoir Capacity
300LX 34 L (9 gal)
600LX 34 L (9 gal)
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