Cub Cadet TANK S Series: Hydraulic Drive & Steering System - Manual (Page 10)

DRAINING THE RESERVOIR HYDRAULIC OIL:
Park the unit on a flat level surface.
Apply the brake.
Remove the ignition key.
Disconnect the battery.
Disconnect the spark plug wires.
If the unit has been running, allow engine and hydro system to cool sufficiently.
Clean the area around the fill cap, filter assembly and bottom surface of the reservoir tank.
Lower the deck to the lowest position.
Place a 1 gal. shallow pan under the reservoir.
Carefully remove the drain plug ( 5/8” wrench) allowing the oil to drain into the pan.
After oil is thoroughly drained, wipe the reservoir drain opening and drain plug clean.
Replace drain plug.
Fill reservoir to specified level with Shell - Rimula Premium 15W40 Oil plus Ornite Additive.
SEE: Hydraulic Oil / Fluid Specifications, Page 3.
Run unit to operating temperature and recheck oil level. Add if necessary.
CLEANING THE RESERVOIR:
* It is recommended that the reservoir be cleaned at the 500 hr. servicing.
After the oil is drained from the reservoir, install the drain plug.
Remove the filter and siphon bowl from the filter assembly.
Pour an appropriate solvent into the reservoir to about 1” – 2” from the bottom.
Solvents as those formulated for Parts Cleaners, Kerosene or Diesel Fuel can be used.
DO NOT USE Gasoline or other highly flammable liquids.
Always use solvents in a well ventilated area and avoid inhaling fumes or vapors.
Access through the filter housing with the cup removed.
Use a long handle brush to agitate solvent and loosen the particles in the bottom of the tank.
Drain the solvent and repeat the procedure until drained solvent is clean.
After the last flushing, use a clean lint free cloth to swab out any remaining solvent in the tank.
* Complete system cleaning and flushing is required when performing major repairs due to
component failures.
When a component fails, pieces of internal parts can become lodged in hoses, lines and fittings.
These pieces can restrict fluid flow and damage new components after installation.
Drain system as previously described.
Disconnect all hoses and lines and thoroughly clean, flush inside and inspect before reuse.
Remove the complete filter assembly from the reservoir.
Unbolt and remove the reservoir tank from the unit.
Thoroughly clean and flush the inside of the tank.
Inspect all components before reinstalling.
PURGING AIR FROM SYSTEM:
Controls unresponsive, hard to operate or jerky.
Air in reservoir indicated by frothy oil, light colored oil ( also can be water in oil), air bubbles observed
in reservoir while running and oil is circulating.
Always check hoses and fittings that they are properly tightened and without abrasions.
Purging the Steering / Drive System:
Park unit on flat level surface.
Check oil level. Add if necessary.
Raise the rear (drive wheels) off the ground and secure with blocks or jack stands.
Open the drive pump by-
pass valves (7/16” wrench). See operators manual.
Operate the FWD and REV control pedals at least 6 times in each direction.
Turn the steering wheel slowly from right to left.
When the full left or right stop is reached, keep turning the steering wheel until resistance is felt.
Repeat the turn right and left at least 6 times.
Close the drive pump by-pass valves, check oil level, repeat procedure with by-pass valves closed.
Repeat full procedure until proper performance is achieved.
The hydraulic oil may still have some air in it after desired performance is achieved.
Allow the fluid to settle, 4-8 hrs, and recheck.
If the fluid still indicates air in the system after purging, allowing the oil to settle and running.
Check all fittings, hoses and components for possible leaks.
Jms/CTP Page 10 of 11 1/10/2012