Kobelco Compact Seal CX-500

Oil-lubricated stern tube seals (aft at forward)

The Kobelco Compact Seal CX-500 keeps sea water out of the oil-lubricated stern tube and keeps oil in. The aft seal has Viton lip sealing rings (No.1–No.3) running on a chrome steel liner fixed to the propeller boss; the forward seal has rings No.4 and No.5 with its own oil tank. The finished plan has assembly drawings with parts lists for both seals, the distance ring, tank arrangements, repair rules (liner skimming limits, alignment after refitting) and a daily/weekly inspection table linking each abnormal reading to its likely cause and the action at sea.

I-click ang piyesa sa model para makita ang numero at gamit nito.Buksan ang 3D manual

Mga maintenance procedure

Seal renewal in dry dock

1. With propeller and shaft withdrawn, detach the seal housings from the hull. p. 29
2. Replace sealing rings; skim the chrome liners if worn, within the D − X limit, otherwise renew the liner. p. 29
3. Use stainless steel bolts for the aft seal when reassembling. p. 29
4. Refit and check alignment with dial indicators: eccentricity 0.2 mm, squareness 0.1 mm per diameter (670 types and below). p. 29

Mga maintenance interval

Item	Kailan	Gagawin	Manual
Stern tube oil temperature	daily	Over 60 °C: check white metal in strainer, cooler, thermometer; slow down if bearing damage	p. 31
Stern tube oil pressure and tank level	daily	Sudden drop: look for leaks at forward seal or oil outside the ship	p. 31
Aft seal drain	weekly	Check for emulsified oil / seawater and drain it	p. 31
Forward seal tank level and temperature	daily	Sudden rise or drop indicates No.4/No.5 ring damage; refill or recover oil	p. 31
Aft seal tank level	daily	Sudden rise with emulsion means seawater past rings No.1/No.2	p. 31

Mga sira at ang dapat gawin

Stern tube oil above 60 °CBearing damage, cooler or thermometer faultSudden drop of stern tube oil levelLeak from aft or forward sealEmulsified oil or seawater in drainDamaged No.1/No.2 rings or trapped foreign matterFresh water in drainLeak from aft peak tankForward seal tank level changesNo.4 or No.5 ring damage

Technical specifications

Seal size	CX-500 (shaft liner 500 mm class)	p. 1
Sealing rings	Viton, aft and forward	p. 2
Liner skimming limit	D − X: X = 3.4 mm for size 500 (e.g. 600 type: 3.7 mm)	p. 29
Alignment after refitting (≤670 types)	eccentricity 0.2 mm/dia, squareness 0.1 mm/dia	p. 29
Stern tube oil temperature alarm	over 60 °C	p. 31
Oil pressure margin for seawater ingress	raise 0.3–0.5 kgf/cm² above normal	p. 31

Pinagmulan: manual ng gumawa na “EM-35 KOBELCO COMPACT SEAL-STERNTUBE SEALING”, 47 pahina. Ang numero ng pahina ay ayon sa orihinal. Suriin ang manual sa barko bago magtrabaho.

Awtomatikong isinalin ang pahinang ito. Ang part number, code at pahina ay ayon sa orihinal.