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maintenance manual of power press machines

Views: 352     Author: Site Editor     Publish Time: 2021-12-30      Origin: Site

This article is to introduce the maintenance process and details of power press machines.


Routine inspection

The machine inspection and maintenance are very important for keeping its safety operation and prolonging its working life, so the inspection and maintenance before operation must be carried out carefully.




There are not leakages on air, lubrication and hydraulic pipelines


No damaged & well connected

Air pressure 

The air pressure is about 0.5Mpa


No water in pneumatic dual component, filter relief valve and mist catcher


Enough oil in gear case, ball coupling between ram and link, hydraulic overload protection oil bath and lubrication pump

Flywheel direction

Start the main motor to find out if the flywheel run in accordance with the arrow marked there

Slide movement




Emergency stop

Press the E-stop button then the slide and the main motor will stop immediately

Press and hold the E-stop button. At the same time, do other action, the movement will not be fulfilled 

Guide way

Five minutes later, the surface of the guide way will be fully lubricated and no thermal hazards


Stop immediately as shield the beam in operation

After opto-electronic emergency stop, the machine cannot be started without resetting the module first 

CAUTION: If find out any circumstance do not conform to the standards, fix or report them timely. 


Periodical Inspection

After a period of operation, some errors may occur such as parts loose, dirty and less oil. If not pay attention to such conditions, they may make operator inconvenient even seriously influence the safety operation and machine life.


Inspection once every three months (500 hours)




Before switch on the power

The screw and nuts

Use spanner to turn them 

The screws and nuts of main parts are tightened (such as main motor base, the cover of the flywheel, guide way, worktable and balancing cylinder etc).

Lubrication system

Optical check the oil gage 

Enough oil in lubrication pump and link ball coupling. 

Connectors are tightened and no leakage.

Electrical system

Turn cam by hand

With proper looseness

Optical checking then use ohmmeter to find out if they are well connected

The connector and roller of cam are well connected

Optical checking

The spring, bolt and pin on cam shaft are ok

Optical checking

Thermal relay connectors are ok

Optical checking

All switches and buttons are clean and tightened

Turn with screwdriver

Terminals in electric cabinet are tightened

The screws to fix electric cabinet are tightened

The v-belts

Optical checking

No twisting, no damage and being properly tensioned

After main motor is started

When starting

Optical checking and hearing 

When starting the main motor, no racing, no abnormal noise

When flywheel speeds up, no obvious vibration

No abnormality with clutch –brake and dual valves



Optical checking

No abnormality with switches and buttons

Driving &Operation

Optical checking 

The hand of the crankshaft indicates the right angle

Optical checking and hearing

No abnormal vibration and noise when starting the slide

Optical checking

The slide stops at top dead position in single and continual operation

Hand touching

No overheat in bearings and sliding part

Optical checking

No abnormality in every slide stroke running

Optical checking

Repeated operation of inching, single and continual stroke running are ok

Slide adjustment

Optical checking

The showing value is right the height of the shut mold

The function of slide adjustment is ok

The limit switch can really stipulate the upper and lower limits of the slide adjustment

The function of air ejector is ok


Inspection once every 6 months (1,000 hours):

The items are the same as those of inspection of every 3 months. Replace grease at the slide ball coupling after 6 months (or 1,000 hours) operation.


Inspection once every year:

The items that must be inspected once every year for the safety operation and long working life as follows:





Optical checking after removing the back cover

No split and other damage on the surface

Check the tightness of the screws and nuts by spanner

Be properly tightened

Driving system

Optical checking

No abnormality on the surface of the crankshaft and bearing: good grease filling condition

Check axial and radial run-out of the flywheel and grease filling condition

No abnormality and filling properly

Check tightness of cam shaft and driving gear pair

Properly tightened

Check chain tightness 

Properly tightened

Check ram motion, bearing and gear shaft

No abnormality or split

Slide driving

Check slide starting as ram adjustment within its range

Check start and stop of upper and lower limit switches of slide

Stop at upper and lower limits correctly

Check piston rod and the appearance in balancing unit

No crack, damage or obvious air leakage

Check if guide way clearance is proper

Proper clearance and flexible motion (refer to “ram and guide way adjustment”)

Air system

Check piston starting condition

No abnormal condition

Stop main motor and check operation by inching

No abnormal condition when starting air supply or exhaust

Check muffler, pressure relay, oil mister, filter

No clogging or damage

Air reservoir and pipe connector

No damage, crack or air leakage

6.1  Inspection once every 3 years:




Accuracy calibration

Calibrate machine accuracy as all clearance, parallelism, verticality and flatness

Based on “JB1280-83 Gap Frame Presses Accuracy” 


Check wearing surfaces of friction disks and braking disks

Replace them if necessary

Check if spring is deformed or broken

Replace it if necessary

Check if seal ring is aged or air leaky

Replace it


Check wearing degree of ball coupling and screw

Replace it

Remove and clean seal ring, replace grease

Clean it

Slide guide way and balancing cylinder piston

Check wearing degree of ram guide way

Repair it 

Check wearing degree of balancing cylinder piston and piston rod

Repair or replace it

Sealed bearing

Check or replace with clean grease

Clean and replace it

Cable, rubber tube

Check if metal hoses, cables or rubber tubes of motive parts are aged or damaged

Replace with new ones







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