Landoll 425B Series, Operator'S Manual

Page: 47 / 88

MAINTENANCE AND LUBRICATION
4-7
Hydraulic System
General
1. Check the oil level of the tractor wet kit or hydraulic
engine power hydraulic tank weekly, or after any
leakage.
See Table 4-1 for proper hydraulic oil.
Check the hydraulic oil level with hydraulic cylinders
in the retracted position and the hydraulic pump
disengaged. Enough volume in tank (approximately
15 gallons) above hydraulic oil level must be available
to accept extra oil from cylinders when retracted.
2. Overfilling can cause hydraulic fluid overflow during
operation.
3. Dock leveler flow bypass regulator must provide 2.5
to 3.0 gallon per minute to dock leveler valve for
Single Pair Dock Leveler (62,000 lb.). Dock leveler
flow bypass regulator must provide 6.0 gallon per
minute to dock leveler valve for Double Pair Dock
Leveler (124,000 lb.).
4. Hydraulic system pressure relief valves should be set
at 2500 psi.
Hydraulic Engine Package
1. Check the hydraulic oil level weekly, or after any
leakage.
See Table 4-1 for proper hydraulic oil.
Check oil level with the undercarriage cylinders
extended and all other hydraulic cylinders in the
retracted position and with the engine stopped.
2. Check hoses weekly for cracks or leaks. If a valve or
line leaks, it should be replaced immediately.
3. Check the engine oil each time before using. Oil level
should be maintained between the “L” and “F” marks
on the oil dip stick. For further maintenance
procedures and proper lubrication specifications,
please refer to the engine owner’s manual that was
supplied with the hydraulic engine package.
4. Replace hydraulic filter with new filter (See
Table 4-2.)
5. Use the fuel recommended for the engine package
installed on your semitrailer.

WARNING
If more oil than specified is sent to dock leveler
valve, damage to dock levelers and personal
injury can occur. If less oil than specified is sent
to dock leveler, they will not operate or operation
will be erratic.