MTS Series 685 Hydraulic Grip Supply - Manual (Page 42)

Series 685 Grip Supply Product Information 42
Hydraulic Fluid Maintenance
Maintenance
Hydraulic Fluid Maintenance
Note Hydraulic fluid maintenance is required only for the Model 685.10 and
Model 685.22 Hydraulic Grip Supplies.
Checking the
fluid level
The reservoir has a built-in sight gage for checking the level of fluid in the
reservoir. When the 11.4 L (3.0 gal) reservoir is filled to the recommended level,
the sight gage will show fluid to the “HIGH” level on the gage and the reservoir
will contain 8.3 L (2.2 gal) of fluid.
Mixing different brands or types of hydraulic fluid can create contaminants.
These contaminants will damage the hydraulic grip supply.
Do not mix different brands or types of hydraulic fluid in the hydraulic grip supply.
Use Mobil 525 SHC fluid only.
• Do not operate the hydraulic grip supply if fluid level is below the “LOW”
level on the gage. (The reservoir contains 6.1 l [1.6 gal] of fluid at the
“LOW” level.)
• Check the sight gage daily.
Fluid loss, if any, should be minimal and typically occurs only when hose
connections are opened to change grips or when removing samples for
checking the condition of the fluid.
Find and correct the cause of any unexplained fluid loss, and then fill the
reservoir to the “HIGH” level.
Checking the hydraulic
fluid
Check the condition of the hydraulic fluid every three months or any time the
fluid in the sight glass shows any sign of the conditions mentioned in the table
below.
Obtain a sample of fluid and check the following table. If any of the conditions
listed below are evident, replace both the hydraulic fluid and the hydraulic fluid
filter element. A fluid sample may be obtained by removing the breather from the
top of the reservoir and then siphoning fluid from the reservoir.
CAUTION
F LUID C ONDITION D ESCRIPTION
Dirty fluid Fresh hydraulic fluid is typically clear. Any change
in color (such as darkened fluid) indicates that it is
time to replace the fluid.
Chemical breakdown Considerable darkness, burnt odor, or an opaque
quality of the fluid indicates chemical breakdown.