Hydraulic Filter; Hydraulic System - Jacobsen ES Series Safety, Operation & Maintenance Manual

8.5

HYDRAULIC FILTER ________________________________________________________

If you open the closed hydraulic transmission circuit, you need to fill the circuit with oil before the
circuit is used again. When you fill the hydraulic tank, use only clean oil.
The hydraulic oil must go through a 25 micron filter before the oil enters the tank.
The hydraulic system is protected by one 10 micron filter. A 25 psi (1.7 BAR)
visual indicator (A) is on the side of the filter head to indicate when service is
needed.
When you replace the filter:
1. Fill the new filter with hydraulic fluid and lubricate the filter O-ring
with hydraulic fluid before you assemble the new filter. Tighten the
filter with your hand before tightening the filter to 25 Nm (18.5 lbf-
ft).
2. Operate the engine at the idle speed for five minutes to remove
the air from the hydraulic system. The hydraulic filter warning light
may illuminate for up to thirty minutes in cold conditions.
3. Stop the engine and check the level of hydraulic fluid in the tank. Add the hydraulic fluid to the full
mark on the dipstick.
8.6

HYDRAULIC SYSTEM _________________________________________________

Drain and replace the hydraulic oil if one of the following occur.
1. Component failure.
2. Water or foam is in the hydraulic fluid.
3. The hydraulic fluid has a rancid odor (indication of high heat).
4. When required by maintenance schedule.
Always replace the hydraulic filter when you replace the hydraulic fluid.
Change The Hydraulic Oil.
1. Clean the area around the oil cap to prevent dirt from entering the
hydraulic system.
2. Disconnect the hose (B) from the gear pump. Allow the oil to drain
into a container.
3. After the oil has drained, reinstall the hose and fill the tank with hydraulic fluid through filler (A).
4. Start the engine and remove the air from the hydraulic system. Operate all mower functions for 5
minutes to remove the air and to balance the hydraulic fluid level.
5. When all air is removed from the hydraulic-fluid, check the level, add the hydraulic fluid to the full
mark on the dipstick.
Hydraulic oil can damage your skin. Use the applicable safety equipment. If engine oil touches the
Discard used engine oil in accordance with local regulations.
MAINTENANCE AND LUBRICATION 8
NOTICE
CAUTION
skin, clean the area immediately.
A
B
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