Hydraulic Oil Requirements
The hydraulic system is filled with KOEHRING SPEC 805 hydraulic oil to give the unit the
highest performance as a hydraulic machine and to provide proper lubrication for the
hydraulic components. To ensure the longest life for this piece of equipment, particular
attention must be paid to maintain oil at the proper level with an approved hydraulic oil and
to keep the circuit system clean.
The oil for the hydraulic system performs the dual function of lubrication and transmission
of power. Oil must, therefore, be selected with care and with the assistance of a reputable
supplier. To guide in the selection of this oil, the general requirements are specified below.
Good oils are economical in the long run. Check with the oil manufacturer prior to the use
of his product.
Oils which conform to Koehring Specification 805 are recommended for most conditions.
Under certain climate and operating conditions, it may be advisable to use a fluid of heavier
or lighter viscosity in order to maintain a viscosity less than 7500 SSU at start-up and more
than 50 SSU during operation. These machines should not be operated with hydraulic
reservoir temperatures in excess of 200°F (87°C) due to possible excessive damage to the
hydraulic oil and rubber components (hoses, seals, shaft seals, motor seals etc.). If over-
heating occurs, discontinue operation and:
1. Check the hydraulic fluid level.
2. Check the oil cooler for cleanliness.
3. Check the oil viscosity versus the recommended Ambient Temperature may require an
oil change.
4. Check the hydraulic system efficiency a pump may be failing or a relief valve set low.
5. Reduce the duty cycle of the machine.
6. Consult an authorized DISTRlBUTOR.
ENGINE OILS:
Engine oils that meet Mil Spec 2104 and have the anti-wear additive zinc dithiophosphate
can be used as hydraulic oils. DO NOT USE C.D. rated engine oil, some of which will not
protect against wear in hydraulic pumps and motors.
Not all motor oils have zinc dithiophosphate. Those that do not have this heavy
duty additive can cause immediate failure of pumps.
Engine oils tend to form sludge in the presence of water. This sludge can plug the filters so
they will require frequent changing. This is not detrimental to the machine unless the filters
are allowed to plug so badly that they by-pass oil.
Never use multi-viscosity grades of engine oil because of the shear and thin out
characteristics of this type of oil.
163P/N 12261-319 REVISED: August 2012
Courtesy of Crane.Market
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