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Repair Instructions

Rotary Joints Series DQ / DQL

1 General information

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Repair work is required during preventive maintenance, or when leaks are detected at the rotary joint housing, or when the oil level in the cooling unit KE / KEW

changes. Repair work may only be performed by trained staff.

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Prior to repair work, let off the oil from the heat carrier and cooling circuits and dismantle the hoses.

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Remove the screws at the K flange and dismount the rotary joint from the roller.

2 Dismantling the rotary joint

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Place the rotary joint vertically.

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Loosen the screw connections 430 and 450, dismantle elbow 150, main housing 30 and flat packings 360 and 370 - make sure not to damage the internal parts!

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Loosen screws 100-100 and dismantle set screws 100-50.

Slightly turn and pull off packing unit - if unit cannot be removed this way:

Use threaded blind hole S to pull with threaded rod, flat steel piece and nuts. Evenly tighten the nuts in order to avoid damage.

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Dismantle holding disk 140.

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Carefully loosen screws 400 and 410 and centrically remove cover 120 (slightly spring-loaded) - make sure not to damage internal parts.

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Dismantle bearing housing 40 - DQL: pull off securing ring and shaft sleeve 170.

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Remove grooved nut 240 and tapered roller bearing 200 and 202 with distancer and fitting rings from rotor - the nut is easier removed if force F is applied at

bearing 200 in order to relieve springs 270.

3 Evaluating the parts

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The quality of the sealing surfaces DF of axial face seals 100 and 110 is of particular importance. When new, they are

lapped - repair of sealing surfaces DF is only possible if they are carefully lapped and when the wear tolerance at the coal

parts is at least 1.5 mm!

Carefully remove deposits. If this is not possible, replace the sealing parts in question.

Information on replacing sealing parts:

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Replace counter ring 110-10 as per detail Y: (not DQL)

Carefully pull the counter ring out of cover 120, using a suitable tool (e.g. hook). Apply force evenly (use hook at differ-

ent points). Clean the cover inside - particularly the O-ring seat.

Mount O-Ring 110-50 to counter ring 110-10. Use a soft holder to push the unit down in order to avoid damage to the

sealing surface DF! Make sure to use at least a protective piece.

Apply the press-down force at the center. Observe the correct alignment of locking pin and groove. The process is com-

plete when you feel a slight counterforce.

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Replace rotating ring 110-20 as per detail Y: (not DQL)

Remove rotating ring 110-20, O-ring 110-60 and springs 110-40, check and replace, if necessary. Clean O-ring seat

and spring area.

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Replace counter ring 102 as per detail X :

Push out counter ring by means of suitable tool (e.g. pin and hammer). Apply force evenly (use pins at different points)

and watch out for position of locking pin.

Remove profile ring 100-70 with screw driver - clean sealing surface.

Mount profile ring 100-70 to counter ring 102. Use a soft holder to push the unit down in order to avoid damage to the

sealing surface DF! Make sure to use at least a protective piece. Apply the press-down force at the center in order to

ensure minimum run-out tolerance at sealing surface DF.

Maximum run-out tolerance ± 0,05 mm.

Observe position of locking pin.

The process is complete when holding disk 140 evenly contacts the surface of bearing housing 30.

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Always replace flat packings 360, 370, profile sealing 100-70 and O-rings 350, 110-50, 110-60.

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Clean or replace tapered roller bearings 200 and 202, depending on condition.

DQL: new lubrication of bearing 200 (480 ccm) and bearing 202 (240 ccm).

Required lubricant quality: Lubcon TURMO TEMP LP 5002 by Lubricant Consult GmbH (phone.: ++49-6109-62018).

Can with 1 kg grease with Maier ordering no.: 3118219

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Remove deposits from rotor and housing parts by means of sand paper (grain 300).

DQL: also check sealing surface at shaft sleeve 170. Repair or re-

place. Always replace shaft seal 130.

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Rotary joint version B2 : Reducing bushing 190 with grooves in running surface must be replaced.

ND 150

IDQ150_E.DOC

Spare part

Wearing part