Hydraulic Oil; Hydraulic Filters - Jacobsen 70528 Parts & Maintenance Manual

4 MAINTENANCE

4.14 HYDRAULIC OIL __________________________________________________________

Refer to Section for specific maintenance intervals.
Drain and replace the hydraulic oil if you notice the
presence of water or foam in the oil, a rancid odor
(indicating excessive heat), or after a major component
failure,
Always replace both hydraulic filters when oil filter light
stays on or when changing oil.
To change hydraulic oil:
1. Clean the area around the oil cap to prevent
impurities from entering and contaminating the
system.

4.15 HYDRAULIC FILTERS ______________________________________________________

The hydraulic system is protected by two 10 micron
filters; a charge filter (B) and return line filter (A). Flow
though the filters is monitored during operation. When
pressure drop across the filters is too high the hydraulic
oil filter warning light will come on. To ensure continued
protection to the hydraulic system, replace filters as soon
as possible if light continues to remain on even after
hydraulic fluid has warmed up.
Note: The warning light will normally come on
immediately after starting tractor and remain on until oil
has warmed to operating temperature. Wait until oil has
warmed up and light goes out before operating tractor.
To replace hydraulic filters:
Replace filters once a year when changing hydraulic
fluid, or when filter warning light on instrument panel
remains on.
The return line filter is mounted to the left side of the oil
cooler. The charge filter is mounted to the lower part of
the tractor frame behind the left side lift arm.
1. Remove the old filters.
Note: Some hydraulic fluid will drain when removing
the lower charge filter. Place a drip pan under filter
before removing.
2. Install new filters. Hand tighten only.
3. Operate engine at idle speed with hydraulic system
in neutral for five minutes. The oil level alarm may
sound during this time.
4. Check hydraulic oil level in reservoir and fill to full
mark on dipstick.
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2. Remove drain plug from bottom of tank.
3. After oil has drained install drain plug and fill with
Jacobsen Hydraulic oil.
4. Purge air from system.
a. Operate all tractor functions for about 5 minutes
to purge air out of the system and stabilize the oil
level. During this time, the oil level alarm may
sound.
b. Once the level has stabilized and the air is
purged, fill the tank to the full mark on dipstick.
Start engine and check that oil alarm remains off.