© May 2023 32 GTZZ14EJ&16EJ Maintenance Manual
MAINTENANCE INSTRUCTIONS
Hydraulic Hose and Fitting Tightening
Procedures
The hydraulic hose and fitting must be installed as per
the following requirements:
1. Before installation, check the seals on the hose and
fitting, and replace the seal or even the hose assem-
bly and fitting if the seal is found to be damaged or
oil spills out of the seal; if not, clean the hose and fit-
ting before installation.
2. If the seal is to be replaced, lubricate the replace-
ment seal before installation.
3. For installation, align the fitting, hose and hose nut,
and tighten the nut with the torque specified in and
Page 22, Hydraulic Fitting Torque. Once the tight-
ening torque of the fitting or hose exceeds the speci-
fied value, its seal cannot be reused.
4. After installation, test all machine functions and in-
spect the hose, fitting and related components for
leaks.
Application of Insulating Silicone
Grease to Electrical Connections
Insulating silicone grease should be applied to all elec-
trical connections for the purpose of:
• Avoiding oxidization of the mechanical joints be-
tween the male pin and female pin.
• Avoiding electrical failure due to low conductivity be-
tween the pins in humid environment.
The following instructions should be observed to apply
the insulating silicone grease to the electrical connec-
tions. Those instructions apply to all plugged connec-
tions outside of the power distribution box. The silicone
grease is not suitable for the connectors with enclosed
outer surface.
1. Prior to the machine assembling, apply silicone
grease around the male pins and female pins inside
the connectors to prevent oxidization. An injector
may be used for the convenience of operation.
NOTICE
Oxidization exceeding a certain period will in-
crease the resistance of the connector and even-
tually lead to electrical failure.
2. Silicone grease should be applied to each electrical
cord that is exposed outside the connector to pre-
vent short circuit. Besides, the joint between the
male connector and female connector should also
been applied with silicone grease. Other joints that
may allow ingress of water into the connectors, like
the area around the anti-pull buckle, should be prop-
erly sealed as well.
NOTICE
Since the electrical conductivity of cleaning sol-
vents is superior to that of water, the conditions
above are mostly likely to happen when using
pressure cleaning method to clean the machine.
3. Silicone grease should be applied to each contact of
the connectors for battery box and charger.
NOTICE
The setting-type sealant can be used to avoid
short circuit and keep the connections tidy, but it
will make the future removal of pins more difficult.
Lubrication
The relevant components should be lubricated at de-
fined intervals using the lubricant with the quantity, type
and grade as recommended in this manual. If the rec-
ommended lubricant is not available, contact local sup-
plier to purchase the recommended or other satisfactory
lubricant.
Hydraulic System
1. Contaminants are the primary hazard to the hy-
draulic system. Contaminants can enter the hydraul-
ic system in various ways, such as improper use of
hydraulic oil, moisture, grease, metal chips, sealing
elements and sand entering the system during
maintenance, or cavitation of the hydraulic pump
due to insufficient system preheating or leakage of
pump supply (suction) lines.
2. Oil in cloudy color indicates a high moisture or air
content, which contributes to organic growth, lead-
ing to oxidation or corrosion. In such case, drain the
waste oil in the hydraulic system, and fill with clean
hydraulic oil after rinsing the hydraulic system.
3. Frequently check the filter for the presence of metal
particles. Because hydraulic components are de-
signed and manufactured to very tight tolerances,
even a small amount of contaminants entering the
system can cause wear or damage to hydraulic
components and often lead to malfunction during
machine operation. Hydraulic system filters should
be inspected, cleaned or replaced as needed at re-
quired intervals.
4. Keep the hydraulic system clean. After disconnect-
ing the hydraulic lines, seal the pipeline ports imme-
diately to prevent contaminants from entering the
hydraulic system. If signs of metal or rubber par-
ticles are found in the hydraulic system, the hydraul-
ic oil should be drained immediately and the entire
system flushed.
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