Section 6: MAINTENANCE Page 4
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OM-ZR-May15
Hydraulic System
To maintain the maximum operating efficiency in the precision parts of the hydraulic system, it is extremely
important to eliminate factors that can cause breakdowns or unsatisfactory performance in the system.
Among the most common of these factors are rust, corrosion, contamination and products of oil deterioration.
Most problems can be minimized or avoided simply by maintaining a disciplined preventive maintenance pro-
gram.
Draining and Filling Hydraulic Oil Reservoir
Checking oil level:
Make sure hydraulic oil is visible in the sight gauge on the reservoir.
!WARNING – Equipment!
Power Unit should not be operated if hydraulic oil is not visible in sight gauge.
Adding oil:
Use the manual pump mounted on the engine-side behind the reservoir. Oil is added to the
reservoir through the return filters (F1) to insure no dirt enters.
Draining oil:
Drain by removing the plug on the bottom of the reservoir.
Changing Hydraulic Return Filter Elements (filter on back of reservoir)
Removing return filter elements
1. Loosen the bolts on the cover and rotate cover clockwise
2. Bypass check valve and spring will come off with cover
3. Remove the filter elements from the filter housing
Replacing return filter elements
1. Clean filter housing with a lint free rag
2. Slide new filter elements into housing making sure element engages tube in back of housing
3. Replace cover and tighten the cover bolts
Changing Hydraulic Return Filter Element (filter on top of reservoir)
Removing return filter element
1. Loosen the bolts on the cover and remove cover
2. Bypass check valve and spring will come off with cover
3. Remove the filter element from the filter housing
Replacing return filter element
1. Slide new filter element into housing making sure element engages tube in bottom of housing
2. Replace cover and tighten the cover bolts
