Maintenance
Hydraulic System
5
5-16
60HD-Rdoc072619
Maintenance
5.12 Hydraulic System
WARNING!
Disconnect and lockout power before performing any ser-
vice to the electrical system. For battery-powered equipment, discon-
nect the negative battery terminal cable. For AC-powered equipment,
follow the lockout procedure provided in the safety section (
). 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 5-10.
If you are operating in temperatures -20° to 100° F (-29° to 38° C), use
an all-weather hydraulic fluid such as Conoco MV32. For alternate fluids and/or other
temperature ranges, refer to the chart below. Operating above the recommended tem-
perature range of a fluid could result in excessive pump wear. Operating below the rec-
ommended 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.
FIG. 5-10
50
HD0049D
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
Level A Fluid
Level B Fluid
Level C Fluid
HY
DRAUL
IC F
LUID
TEMPERATURE
