MAINTENANCE
GTTZ10EJ Maintenance Manual 5-39 © Mar. 2022
UNSAFE OPERATION HAZARD
• Before removing the hydraulic
hoses from the cylinder, place a
block under the cylinder for
support.
• Identify the hydraulic circuit
before removing the hydraulic
hoses.
Note：
• Tag the hydraulic hoses and connections for the
ease of re-installation.
• Collect the hydraulic oil spills in a suitable container
to avoid environmental polution.
After removing the hydraulic hoses：
1. Timely cap the hydraulic hoses and elements to
prevent contamination to the hydraulic system.
2. Inspect the cleanliness of hydraulic elements and
hoses (free of rubber, plastic and metal scraps).
3. If needed, drain and flush the hydraulic piping (-
including hyraulic tank).
4. Re-installing the hydraulic hoses
Note：
• Refer to the position tags or markings for re-
installation
• Tighten the hydraulic hoses according to the torque
specifications. See Fastener Torque
Specifications, page 2-10.
After re-installing and tightening the hydraulic
hoses：
1. Start the machine from the ground.
2. Properly move the hoses to drain the hydraulic
system.
3. Inspect for hydraulic leaks.
4. Check the hydraulic oil level in the tank.
5. Check the pressure.
Hydraulic Filter
1. Preparation
UNSAFE OPERATION HAZARD
• Cordon off the test area before the
maintenance is performed.
• Perform the procedures with the
machine in stowed position.
• Be sure to wear goggles,
protective clothing and gloves.
• The disassembly, if needed, must
be performed by qualified trained
personnel with power supply
completely off.
HIGH TEMPERATURE HAZARD
Before inspecting or replacing the
hydraulic elements, allow the
hydraulic oil cool down to room
temperature.
2. Replacing the hydraulic element
HIGH PRESSURE HAZARD
Slowly release each component to
dissipate the pressure. Hot hydraulic
oil may penetrate the skin. Please
seek medical attention immediately if
hurt.
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