A good lubrication program requires that all nor- mal
wear points be lubricated according to a set schedule
with specific types of lubricants. Refer to the lubrication
chart and the special items covered in this section for
the recommended lubricants, time intervals and lubri-
cation procedures.
Where components such as the engine, transmis- sion
and axles are not manufactured by this com- pany, the
original manufacturer’s recommenda-
The hydraulic system is filled with KOEHRING SPEC
805 hydraulic oil to give the unit the highest perfor-
mance 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 lev-
el with an approved hydraulic oil and to keep the circuit
system clean.
The oil for the hydraulic system performs the dual func-
tion of lubrication and transmission of power. Oil must,
therefore, be selected with care and with the assis-
tance of a reputable supplier. To guide in the selection
of this oil, the general requirements are specified be-
low. 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 cli-
mate 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 ma-
chines should not be operated with hydraulic reservoir
temperatures in excess of 200°F (87°C) due to possi-
ble 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.
tions take precedence should any discrepancy occur.
If there is any doubt about the proper lubricants, inter-
vals or lubrication procedures, refer to the original
manufacturer’s manual.
The lubrication intervals recommended in this section
assume normal operating conditions. Where dust, dirt,
high humidity or extreme heat
are encountered, lubrication intervals should be short-
ened accordingly.
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 DO dithiophos-
phate can be used as hydraulic oils. 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 im-
mediate failure of pumps.
Engine oils tend to form sludge in the presence of wa-
ter. This sludge can plug the filters so they will require
frequent changing. This is not detrimental to the ma-
chine 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.
TRANSMISSION FLUIDS: DO NOT use transmission
fluids. These fluids have been design- ed to work in au-
tomatic transmissions and they will not necessarily
work in hydraulic systems.
MAINTENANCE AND LUBRICATION
HYDRAULIC OIL REQUIREMENTS
4 - 21 Revised: March 2005RT700 Series
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