Maintenance
Hydraulic System
Maintenance
HDdoc012020
3-13
3
3.14 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 inges-
tion. 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 3-12.
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 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.
2.
Replace the hydraulic system cartridge filter every 500 hours of operation.
3.
Periodically check all hydraulic lines and fitting as needed. Replace as necessary.
FIG. 3-12
50
TEMPERATURE
HY
D
R
AUL
IC
F
L
UID
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
TEMPERATURE
HYDRAULIC FLUID
Level A Fluid
Level B Fluid
Level C Fluid
500
