Installation, maintenance, and troubleshooting of Bonfiglioli HF series reducers for hoisting applications

Contact seal: ITP Gasket Seal

PTFE seal: Kl ü ber Petamo GHY 133 N

4.2 Oil Quantity and Level Inspection

The lubricating oil quantities provided in the manual (such as 3.5-5.0L for HF 40, 6.0-8.0L for HF 70, and 14.0-19.0L for HF 125) are for reference only. The actual filling must be operated according to the oil level mark corresponding to the installation position:

If equipped with an oil window, add it to the centerline of the oil window.

If equipped with an oil dipstick, add it to the reference mark.

If equipped with an overflow type oil plug, add it until the oil flows out from the overflow hole.

4.3 Lubricating oil replacement cycle - temperature determines frequency

The replacement cycle of lubricating oil depends on the average operating oil temperature, rather than simply cutting according to the number of operating hours:

Average oil temperature range Mineral oil (EP) PAO Synthetic oil PAG Synthetic oil

T ₀<65 ° C 8000 hours 25000 hours 25000 hours

65 ° C<t ₀<80 ° C 4000 hours 15000 hours 15000 hours

80 ° C<t ₀<95 ° C 2000 hours (within 1 year) 12500 hours 12500 hours

Important: The manual does not recommend continuous operation between 80 ° C and 95 ° C. If the oil temperature is frequently within this range, oil testing should be conducted every 6 months.

4.4 Oil change operation process

Place a suitable container under the drain plug.

Simultaneously open the fuel plug and drain plug to allow the hot oil (which is easier to flow) to be completely drained.

Clean the drain plug magnet (if any), replace the gasket, and reinstall the drain plug.

Add new oil to the designated oil level mark according to the installation position.

Replace the gasket of the fuel plug and tighten the fuel plug.

Safety warning: Hot oil can cause serious burns! Cooling is required before changing the oil. Lubricating oil, solvents, and cleaning agents are toxic, and personal protective equipment must be used during operation. It is strictly prohibited to discharge them into the environment.

Regular maintenance and inspection checklist

5.1 Daily inspection of operational efficiency

Regularly remove dust from the gearbox and motor housing.

Check for any abnormal changes in noise under constant load - abnormal vibration or noise may indicate gear wear or bearing failure.

Check the wear of the friction surface of the brake motor and adjust the clearance if necessary.

Check for leaks at all sealing points, oil plugs, and pipelines.

If the operating temperature rises abnormally, the machine should be stopped immediately to investigate the cause.

5.2 Regular Maintenance Plan

Recommended maintenance cycle in the manual (based on typical operating conditions, adjusted according to actual usage conditions):

Check project cycle

External conditions (pollution, oil stains) 170-720 hours

Oil level check for 720 hours

Oil seal leakage inspection for 720 hours

Breathable filter (if available) 2200 hours

Tighten the installation bolts with a torque of 2000-4000 hours

The elastic components of the coupling have been worn for 2000-4000 hours

Axis alignment inspection every time the oil is changed (9000-18000 hours)

Special attention: For the installation of hollow shafts using tightening discs, the tightening torque of the tightening disc bolts must be rechecked after each maintenance or repair, which is the key to ensuring the reliability of the transmission connection.

5.3 Protection for long-term disuse

If the gearbox will not run for a long time (more than 1 month) after installation or running in period, it should be run without load at least once a month. If this cannot be achieved, anti-corrosion protection measures must be taken, such as applying rust inhibitors or completely filling the box with operating oil (see storage section).

Common troubleshooting checklist

Based on Chapter 8 "Troubleshooting" of the manual, summarize the high-frequency faults, causes, and countermeasures of the HF series:

Possible causes and countermeasures of the fault phenomenon

Bearing temperature too high, oil level too low/oil aging/bearing damage, oil replenishment/oil change/contact authorized repair point

Operating temperature too high, oil level too high/oil aging/oil contamination Adjust oil level/oil change/oil change

Abnormal operation noise, gear damage/excessive axial clearance of bearings/bearing wear/excessive load/oil contamination. Contact authorized repair point/adjust to rated load/change oil

Abnormal noise in installation position. Loose/worn installation bolts. Tighten/replace bolts according to specified torque

Oil leakage, high oil level/poor sealing of the housing or coupling/gasket aging, adjust the oil level/contact authorized repair point

The reducer does not rotate or has difficulty operating. The oil viscosity is too high/the oil level is too high/the load is too heavy/the gear is damaged. Recommended oil for replacement/oil level adjustment/transmission redesign/contact authorized repair point

Important reminder: If the output shaft of the reducer does not run with the motor and the motor is normal, it is highly likely that the gear is damaged. The machine must be stopped immediately and an authorized service center must be contacted.