F-459-R1
3-1
Chapter 3
Hydraulic Oil, Motors, Pumps and Cylinders
Hydraulic Components
NOTE
This section explains the following:
• Hydraulic System Maintenance
• Checking Hydraulic Oil Level
• Changing Hydraulic Oil
• Changing the Hydraulic Filter
• Checking Hydraulic Pressure
• Servicing the Lift Motor and Pump
1.
Set the key switch to OFF. Remove the key from the
key switch and place in a secure area.
2.
Perform a Lock Out/Tag Out procedure and
disconnect the battery.
3.
Make sure all the other wheels are securely blocked
so that the truck cannot move.
4.
Remove the floor plate, if necessary.
Hydraulic System Maintenance
Maintain the hydraulic system and associated
components, as required by the various checklists
beginning on page 1-6.
CAUTION
Cylinders and Valves: Check these components for
drift and leakage. Refer to Landoll Corporation and
other vendor service information for specifications.
Hoses and Tube lines: Check for cracks, hardening,
or other signs of wear. Reroute any usable hoses that
are kinked, severely bent or rest against hot parts.
Look for leaks, especially at couplings and fittings.
Replace any hoses or tube lines that do not meet
system flow and pressure ratings.
Hydraulic Fluid: Check fluid level and look for air
bubbles. Check the filter. See “Change the Hydraulic
Oil Filter” on page 3-2.
Other Hydraulic System Components: Visually check
other components to see if they are loosely mounted,
show signs of leaks, or other damage or wear.
The hydraulic pump in your Drexel SLT30/35 truck is
powered by an AC motor. The pump supplies hydraulic
pressure and mast movements.
CAUTION
Checking Hydraulic Oil Level
IMPORTANT
• It is important that the proper level of specified
oil be maintained at all times. Failure to maintain
the oil level as recommended could cause
serious mast function operating problems.
• The oil level indicated on the dipstick is most
accurate when the oil is at operating temperature
(130°F to 200°F (53°C to 93°C)).
• Do not overfill. Having the level above the FULL
line does not allow enough area for expansion
when the oil heats during normal operation.
Do not allow:
• Hydraulic fluid level to drop significantly or
allow the reservoir to run dry. This will induce
air into the system and cause damage to
hydraulic system components.
• Prevent dirt or other foreign matter from
entering the hydraulic system; clean filler
caps before checking oil level.
After prolonged truck use, hydraulic oil will be
hot and can burn human skin. Allow hydraulic oil
to cool before performing this procedure.
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