Maintenance
Hydraulic System
Maintenance
60HDdoc100206
5-9
5
5.8
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
collapsed.
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
temperature range of a fluid could result in premature pump wear. Operating below the
recommended temperature range could cause the fluid to thicken and could result in
reduced hydraulic cylinder speed. To replace the current fluid with fluid of another type,
drain the old fluid and refill the tank with about 1 gallon (4 liters) of the new fluid.
2.
Replace the hydraulic system filter every 500 hours of operation.
3.
Periodically check all hydraulic lines and fittings. Replace as necessary.
FIG. 5-5
50
TEMPERATURE
HYD
RAUL
IC
FLU
ID
Level A Fluid
Level B Fluid
Level C Fluid
HD0049B
120°
49°
40°
5°
80°
27°
0°
-18°
100°
38°
20°
-7°
60°
16°
-20°
-29°
110°
44°
30°
-1°
70°
21°
-10°
-23°
90°
32°
10°
-12°
50°
10°
-30°
-35°
F
C
500
