8-20 Lift Truck Maintenance
Checking the Hydraulic Fluid
Check the hydraulic sump tank fluid level. Correct fluid level is
important for proper system operation. Low fluid level can cause
pump damage.
Hydraulic fluid expands as its temperature rises. Therefore, it is
preferable to check the fluid level at operating temperature (after
approximately 30 minutes of truck operation). To check the fluid
level, first park the truck on a level surface and apply the parking
brake. Put the upright in a vertical position and lower the fork
carriage fully down. Pull the dipstick out (under the sump breather),
wipe it with a clean wiper, and reinsert it. Remove dipstick and check
oil level. Keep the oil level above the LOW mark on the dipstick by
adding recommended hydraulic fluid only, as required. Do not
overfill.
When checking hydraulic oil, make sure you use a clean
wiper and do not let contaminants get on the dipstick or in
the sump.
Check the condition of the hydraulic fluid (age, color or clarity,
contamination). Change (replace) the oil as necessary
Critical Fastener Checks
Fasteners in highly loaded (critical) components can quickly fail if
they become loosened. Also, loose fasteners can cause damage or
failure of the component. For safety, it is important that the correct
torque be maintained on all critical fasteners of components that
directly support, handle, or control the load and protect the operator.
Check critical items, including:
• Drive axle mounting
• Drive and steer wheel mounting
• Counterweight mounting
• Load backrest extension
• Overhead guard
• Tilt cylinder mounting and yokes
• Upright mounting and components
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