3
TROUBLESHOOTING
MAINTENANCE
Important:
Use only a good grade
hydraulic jack oil. We recommend Mobil
DTE 13 or equivalent. Avoid mixing
different types of fluid and
Never
use
brake fluid, turbine oil, transmission
fluid, motor oil or glycerin. Improper fluid
can cause failure of the jack and the
potential for sudden and immediate
loss of load.
Adding oil
1. With ram fully lowered and pump
piston fully depressed, set jack in its
upright, level position. Carefully
remove from crane. Remove oil filler
plug.
2. Fill with oil until just below the rim of
the oil filler plug hole. Reinstall the oil
filler plug.
Changing oil
For best performance and longest life,
replace the complete fluid supply
annually.
1. With ram fully lowered and pump
piston fully depressed, remove from
crane body. With jack in its upright,
level position, remove oil filler plug.
2. Lay the jack on its side and drain the
fluid into a suitable container.
Note:
Dispose of hydraulic fluid in
accordance with local regulations.
3. Set jack in its level upright position.
4. Fill with oil until just below the rim of
the oil filler plug hole. Reinstall the oil
filler plug.
Lubrication
A periodic coating of light lubricating oil
to pivot points, axles and hinges will
help to prevent rust and assure that
casters and pump assemblies move
freely.
Cleaning
Periodically check the pump piston and
ram for signs of rust or corrosion.
Clean as needed and wipe with an oily
cloth.
Note:
Never use sandpaper or abrasive
material on these surfaces !
Storage
Fully retract the boom to its lowest
position.
Folding Instruction (for Model YA704B
only, see Figure 2 on page 4):
Remove lock pins from the front legs.
Fold the legs up until the they pass the
support bracket hole. Secure legs'
position by inserting the pin and secure
with retaining clip.
Symptom
Possible Causes
Corrective Action
Hydraulic unit will not lift load
Hydraulic unit bleeds off after lift
Will not lift to full extension
• Release valve not tightly closed
• Overload condition
• Fluid level low
• Fluid level low
• Air trapped in system
• Release valve not tightly closed
• Hydraulic unit malfunction
• Ensure release valve tightly closed
• Remedy overload condition
• Ensure release valve tightly closed
• Contact Snap-on Tech. Service
• Ensure proper fluid level
• Ensure proper fluid level
• With ram fully retracted, remove oil filler
plug to let pressurized air escape, reinstall
oil filler plug
Poor lift performance
Hydraulic unit will not lower after
unloading
• Reservoir overfilled
• Linkages binding
• Drain fluid to proper level
• Clean and lubricate moving parts