Service and Repairs
General Precautions for Removing and Installing
Hydraulic System Components
Before Repairing or Replacing Components
1. Remove attachments from the machine.
2. Park the machine on a level surface, engage the parking brake, and remove the
key from the ignition.
3. Clean the machine before disconnecting, removing, or disassembling hydraulic
components.
Note: Cleanliness is necessary whenever working on the hydraulic system. Ensure
that hydraulic components, hose connections, and fittings are clean.
4. Label all disconnected hydraulic lines and hoses for proper installation after
repairs are completed.
5. Note the position of the hydraulic fittings (especially elbow fittings) on the
hydraulic components before removal.
Note: Mark the parts, if necessary, before removal and ensure that they are aligned
properly when installing hydraulic fittings, hoses, and tubes.
WARNING
Before disconnecting or doing any work to the hydraulic system, release all the
pressure from the system; refer to Relieving Pressure from the Hydraulic
System, page 5–2.
CAUTION
The hydraulic fluid may be hot. To avoid possible burns, allow the fluid to cool
before working on the hydraulic system.
6. Install clean caps or plugs on hydraulic lines, hoses, fittings, and components that
are left open or exposed to prevent hydraulic system contamination. Cap or plug
the opening as soon as the system is opened.
After Repairing or Replacing Components
1. Check the hydraulic fluid level in the hydraulic fluid reservoir, adjust the fluid level
as required; refer to the 4520 Operator’s Manual for fluid type and quantity.
2. Lubricate O-rings and seals with clean hydraulic fluid before installing the
hydraulic components.
4520P Page 5–19 Hydraulic System: Service and Repairs
09.40003Rev 00
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