Crawler construction crane
The entire machine is treated, not a single unit: oil-filled gearboxes with gel, couplings and the slewing mechanism with grease. The crane's service life is over 20 years, wear up to 90 %.
Crawler construction crane: 7 gearboxes, 5 gear couplings and the slewing mechanism
The class norm is 3.0 ml per litre in three stages. Here the engineer prescribed a single application of 9.0 ml/l: the crane's gearboxes have no oil filtration, and there is no point in splitting the dose. Industrial reducers and transmissions →
What is treated
- Serviceable gearboxes, couplings and slewing mechanisms with no parts at 100 % wear.
- Oil leaks eliminated, worn seals replaced.
- Gearbox cavities should be flushed (for example, with diesel fuel) and treated on fresh oil.
What is measured before and after
| Parameter | Instrument | How and when |
|---|---|---|
| Nature and level of gearbox noise during operation | sound level meter | — |
| Vibration level and degree of gearbox heating | vibrometer, thermometer | — |
| Condition of contact patches and tooth thickness | gear tooth caliper, visual inspection | — |
| Angular backlash in the gear mesh of the couplings | dial indicator | — |
| Ease and smoothness of tower slewing | observation and measurements | — |
Dosage rates
| Compound | Rate | How and when |
|---|---|---|
| Gel for gearboxes and transmissions — 7 gearboxes | 9.0 ml per 1 litre of standard oil, single application | Total oil volume 107 l: 963 ml of gel. |
| XADO "Repair" grease — 5 gear couplings | filling the cavity in place of the standard grease | 12.5 kg. |
| Same grease — slewing mechanism | greasing in place of the standard grease | 7.5 kg; 20 kg total for the machine. |
Treatment stages
- Dilute the gel in oil at 40–50 °C and add to the gearboxes in a single application; fill the couplings and the slewing mechanism with "Repair" grease.Single application
After treatment
- Gearboxes: full cycle of at least 400 operating hours.
- Gear couplings: at least 500 hours.
- Slewing mechanism: at least 400 hours.
Points to watch
- Coupling parts and the slewing mechanism bearing cavity are cleaned of old grease.
- After the cycle is completed, to maintain the "wear-restoration" balance, greasing is carried out with XADO "Restorative" grease.
Source: XADO applied methodology, lead engineer I. N. Sharaikin. Class norm — instruction IE-24.6-25612000-005-2008, methodology No. 4. Analysis: state/DRIVE_METHODS.md.