76347-385 • 06 -15
4.18
Hydraulics
NOTE
Never increase hydraulic pressure settings. Doing so voids the
manufacturer’s warranty.
When conducting maintenance on the hydraulic system be cautious of leaks,
hot components (pumps, motors, relief valves) and stored energy. Always
follow safety warnings and procedures when conducting maintenance on
the hydraulic system.
Before Conducting Maintenance:
• Allow the machine to cool down
• Relieve pressure within the hydraulic system. Examples of where
energy may be stored include: stalled feed wheels, suspended loads,
charged accumulators, and electric voltage
• Check for leaks. Use a piece of cardboard to check for leaks
Never use your hand!
The hydraulic system provides the fluid that powers certain parts of the
machine’s operation. The main components requiring maintenance includes
the hydraulic oil, filter, and pump.
Hydraulic Oil
The hydraulic oil should be tested every 250 hours or if there are signs of oil
degradation. Signs of degradation include:
• A change in oil color
• Bad aroma to the oil
• Dirty or gritty feel to the oil
• Regular hydraulic component failure
• Louder than normal operation sound
The oil quality may be checked using a commercially available test kit or a
simple Blotter Spot test. The Blotter Spot test consists of placing a drop of oil
on a piece of blotter paper. If the blotter remains colorless or develops only a
light yellow ring, oxidation is under control. Even when color develops but is
uniform throughout, the oil is serviceable. If the sample shows distinct rings,
WARNING!
Hydraulic oil will vaporize and potentially ignite resulting in
explosion, fire, and possible serious injury. Keep hydraulic oil
away from ignition sources (e.g.: flame, smoking, etc.).
Hydraulic oil leaks will result in puddles and slippery
conditions which may result in serious injury. Always clean
up spills and fix leaks immediately.
Pressure may be stored in the hydraulic system even after
the power unit is turned OFF. Relieve hydraulic pressure and
lockout the machine before conducting maintenance.
Hydraulic oil is under pressure. Spraying fluid from a leak
can burn or penetrate the skin and cause serious injury. If
fluid penetrates the skin, immediately seek medical
attention to have it surgically removed!
The hydraulic components (pump, motor) and oil are hot
during operation and can cause severe burns. Always wear
protective face gear and clothing during operation and
maintenance.
General Maintenance • Hydraulics
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