Changing Hydraulic Oil - Wittke STARLIGHT Maintenance Manual

106 Hydraulic System
The changing interval of hydraulic oil may be determined by operational duty cycle, operating
conditions and local maintenance schedule.
It is recommended to change the hydraulic oil at least once a year or when contaminated.
I :
MPORTANT
For proper oil properties and requirements as well as some words of caution, see Hydraulic Oil on
page 31.

Changing Hydraulic Oil

Caution!
Highly contaminated hydraulic fluid must be changed promptly to avoid damaging the
hydraulic system.
Hydraulic oil must be replaced at least once a year.
I :
MPORTANT
To do so:
1. Empty the hydraulic tank (see Emptying the Hydraulic Tank on page 100).
2. Clean the strainer (if necessary) (see Cleaning the Strainer on page 101).
3. With a clean dry cloth, remove all metal particles and debris accumulated at the bottom of the
hydraulic tank.
Insert your hand inside the tank through the opening left by the removal of the strainer and clean
the interior.
4. Put back the strainer.
5. Change the return filter element (see Element Replacement Procedure on page 104).
6.
Using a filtering screen, refill the tank with high-quality oil until it reaches the ¾ mark on the oil
gauge (see Recommended Lubricants on page 31 for specifications).
The entire system will require between 50 and 60 gallons of oil.
Caution!
It is not recommended to mix different brands and/or grades of oil in the hydraulic tank.
7.
If the suction line has been replaced, fill the line until oil reaches the pump.
8.
Reinstall the filler cap and fully open the ball valve (or shut-off valve).
Caution!
Failure to open the ball valve (or shut-off valve) may seriously damage the pump and the
hydraulic system.