Hydro-Park 1127 & 1123
USER MANUAL
45
MUTRADE INDUSTRIAL CORP.
9.4 Maintenance and servicing of cylinder
Only trained and qualified staff is allowed to do inspection, maintenance and service work of cylinder.
9.4.1
Inspection of cylinder
Before installation and usage of cylinder:
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9.4.1.1
Check if the cylinder specifications, such as bore diameter, rod diameter, stroke length, etc. match
the model of purchased parking lift.
■
9.4.1.2
Check if the actual working pressure and system supply pressure of cylinder is sufficient.
■
9.4.1.3
Check if hydraulic oil, working temperature and cylinder cleanness meet the requirement of sealing.
■
9.4.1.4
Check the piston surface if there is any adhered foreign particles or dirt, which will damage seals and
piston rod surface.
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9.4.1.5
No weldment or wiring on cylinder.
■
9.4.1.6
Check regularly if any leakage on hydraulic fluid port, piston rod, juncture of bore and piston.
9.4.2
Maintenance of cylinder
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9.4.2.1
Clean the vent hole quarterly to keep surface of vent hole clean.
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9.4.2.2
Keep clean hydraulic oil in hydraulic circuit by replace hydraulic oil regularly.
■
9.4.2.3
Inject lubrication oil (by injector oiler) through vent hole into lower cavity of cylinder, until
lubrication oil spills from vent hole when cylinder is at maximum stroke.
■
9.4.2.4
Hydraulic fluid port and vent hole is to be well protected from dust, dirt or particles going into inside
of cylinder.
■
9.4.2.5
Low-speed movement or jerky motion of rod has to be stopped and checked to avoid more damage.
■
9.4.2.6
Connection and load parts are to be checked and lubricated regularly. Loosen, galled, bent, blocked,
cracked or deformed part should be replaced in time.
■
9.4.2.7
Score mark and scraping of chromium-layer on one side of piston rod surface means serious wear on
one side. It’s necessary to dismantle and inspect the cylinder, and replace worn part(s).
■
9.4.2.8
Check regularly hydraulic fluid port, vent hole and wiper seal at cylinder tube head end, replace the
broken seals if leakage occurs.
9.4.3
Servicing of cylinder
Trouble
Possible causes
Solutions
Jerky motion of
piston rod
Aerated oil
Air to be eliminate by exhaust
Inlet oil pipe to be replaced
Piston and rod to be aligned
Serious cylinder leakage
Replace seals or increase pump flow
Overlarge minimum stable flow of flow
valve
Flow valve with small minimum stable flow
to be employed
Flexible hose employed between cylinder
and flow valve
Replaced by nonflexible hose
Frictional resistance increases due to
abrasive particles in oil
Clean hydraulic elements, and replace
hydraulic oil and filter
Reduce frictional resistance by lubrication
Frictional resistance is too high or changes
due to improper fabrication or assembly
of parts with relative motion
Poor lubrication between surfaces of
moving parts
Poor seals alignment of cylinder piston
and rod
