Maintenance
Hydraulic System
5
5-17 60HDdoc081208 Maintenance
5.12 Hydraulic System
1. Check the hydraulic fluid level every fifty hours of operation. Add fluid as necessary. The
level in the hydraulic pump should be 3/4" (19mm) from the top with all cylinders col-
lapsed.
If humidity is a problem or the mill is used outside in humid weather, drain and replace two
quarts (.95 liters) of fluid every six months. This will drain any accumulated water and
help prevent pump failure due to water ingestion. It also will prevent excessive fluid wear
and allow the fluid to maintain its hot end performance. If humidity is not a problem, drain
and replace one gallon (3.8 liters) of fluid every year to prevent fluid wear.
See Figure 5-5. If you are operating in temperatures -20° to 100° F (-29° to 38° C), use
an all-weather hydraulic fluid such as Exxon Univis J26. For alternate fluids and/or other
temperature ranges, refer to the chart below. Operating above the recommended temper-
ature range of a fluid could result in excessive pump wear. Operating below the recom-
mended temperature range could result in reduced hydraulic cylinder speed. To change
fluid types, replace one gallon of the current fluid with one gallon of the alternate fluid.
2. Replace the hydraulic system cartridge filter every 500 hours of operation.
FIG. 5-5
50
TEMPERATURE
HYDRAULI
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