Little Wonder TRS-20 - Manual (Page 9)

9
CARE FOR HYDRAULIC SYSTEM
To keep the hydraulic system in working order,
there are a few steps needed to take place. If
synthetic oil were used we would suggest a full
synthetic oil such as Mobil 1 15W50, Quaker
State Full Synthetic 5W50, or a similar oil.
Oil viscosity is very important to transmission
life. For optimum performance the oil viscosity
should maintain a viscosity of 13 cSt [70 SUS].
The minimum oil viscosity to prevent component
wear is 9 cSt [55 SUS]. These Viscosity
requirements are for an oil temperature of 110
degrees Celsius [230 degrees Fahrenheit]
Typically; standard SEA 20W-50 multi-viscosity
motor oils will meet this requirement. If the
operating temperature is elevated then synthetic
oil with greater viscosity index, or more viscosity
at elevated temperatures, may be needed to meet
viscosity requirements.
System Start-up: (purging air from system).
Factory Fills unit with SAE 20W-50 multiviscosity
motor oil. This will need to be checked when
setting up with instructions below.
At system start-up, several things need to be
accomplished to ensure a properly running
system.
1. Fill the BDU case and expansion level and
ensure they do not empty during the
following procedure.
2. Start engine and increase throttle to at least
2/3 speed.
3. Open bypass valve by depressing bypass
plunger and holding.
4. Adjust control linkage such that
transmission control is stroking
full forward.
5. Move and hold control in forward for
3 seconds; repeat two additional times.
6. Close bypass valve be releasing
bypass plunger.
7. With engine still at same speed,
repeat step 5.
8. Move control to neutral.
9. Check engine speed. Adjust to
recommended maximum engine speed.
10. Adjust neutral position.
11. Adjust forward control stop to
recommended axle speed.
12. Adjust reverse control stop to
recommended axle speed.
13. If axle speed is not achieved ensure
linkage allows proper movement of
transmission control.
14. If transmission control lever is rotating
fully but recommended axle speed is not
achieved, repeat start-up procedure.
15. Refill expansion tank oil to
recommended level.