Maintenance
Hydraulic System
Maintenance
HD97doc041910
5-23
5
5.13 Hydraulic System
WARNING!
Disconnect and lockout power before perform-
ing any service to the electrical system. For battery-pow-
ered equipment, disconnect the negative battery terminal
cable. Failure to do so may result in injury and/or electrical
system damage.
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 5-13.
If you are operating in temperatures -20° to 100° F (-29° to 38° C), use
an all-weather hydraulic fluid such as Exxon Univis HVI 26 (formerly named J26). For
alternate fluids and/or other temperature ranges, refer to the chart below. Operating
above the recommended temperature range of a fluid could result in excessive pump
wear. Operating below the recommended 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.
50
