PAGE 82 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
ST-70 — SERVICE INFORMATION
Maintenance check schedule
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1.
When changing the hydraulic oil or topping off the reservoir,
use only the following type. (Reservoir capacity 58 gal.)
Hydraulic oil: Shell Oil Tellius 68 or
Mobil DFE 26
Texaco Rand HDC
The Mayco pump is equipped with an in-tank return hydraulic
filter with a 10 micron cleanable filter. The element has been
designed to remove all particles large enough to cause wear
and job break down. Under normal conditions, we recommend
replacement every 6 month.
Do not mix oil brands! This may impair quality.
The most important factor to keep in mind is the effect of cold
weather on the hydraulic oil. The viscosity (thickness) of the
hydraulic oil will be much heavier.
Always run machine until oil temperature reaches a minimum
of 50 degrees F. before pumping. Damage to the main piston
pump will occur if the machine is cycled too fast before the oil
temperature reaches the minimum of 50 degrees. Cycle the
machine at 6-8 strokes per minute at approximately 1/3 throttle.
In – areas where the weather normally remains under 50
degrees F., use Shell Oil Tellus – 46, or the equivalent. The
above steps must be followed or severe damage to the main
axial piston pump will be the end result.
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