Sleeve Bearings; Shaft Seal - Mechanical Seal - Johnson Pump TG GS2-25 Instruction Manual

The standard "multi-purpose" grease (consistent class NLGI-2) is suitable for temperatures up to
120°C.
For higher temperatures the standard grease should be replaced by a high temperature grease
(consistent class NLGI-3). This grease is, depending on the make, suitable for temperatures up to
150°C or 180°C.
When a pump will be applied in a system or under conditions facing extremely high or low
temperatures, the selection of the proper lubricant and correct lubrication interval should be
made in consideration with your grease supplier.
Do not mix different grades, different makes of grease together. Such a mix can cause severe
damage. Consult your local grease supplier.
Relubrication
• Starting with pump size TG GS15-50, the ball bearings require lubrication through the grease
nipple every 5000 running hours or every 12 months (which occurs first).
• Add a correct grade of grease (see 3.21.3.5). Do not overfill (see table below).
TG GS pump size
Rotor side
Shaft end side
ISO
AFBMA
Grease quantity (gram)
The ball bearing type 2RS1 are grease filled for life and need not to be relubricated.
Both ranges ISO 3000 range and American AFBMA 5000 range are possible and have the
same built in dimensions.
• When the anti-friction bearing has been relubricated 4 times it needs to be cleaned.
Replace the old grease with new one or renew the anti-friction bearings.
• In the case of high temperatures, anti-friction bearings must be relubricated every
500 to 1000 running hours:
- when using grease of NLGI-2 class: for service temperatures > 90°C
- when using grease of NLGI-3 class: for service temperatures > 120°C
• When the load is extremely high, in case the grease looses much oil, anti-friction bearings
need relubrication after each peak service. We recommend relubricating while the pump is still
operating but after the peak load has occurred.

3.21.3.6 Sleeve bearings

We recommend checking the pump regularly for wear on the gear wheels and sleeve bearings to
avoid excessive wear of other parts.
• A quick check can be done by using the front
pull-out and back pull-out system.
See table for maximum allowable radial clearance
of the sleeve bearings.
• For replacement of the sleeve bearings contact
your local supplier.
3.21.3.7 Shaft seal – Mechanical seal
If the mechanical seal leaks excessively, it must be replaced with one of the same type.
Note! The materials of the mechanical seal are selected strictly in accordance with the nature of the
pumped liquid and the operating conditions. Thus the pump must only handle the liquid for which it
was purchased. If the liquid or operating conditions are changed, a mechanical seal suitable for the
new operating conditions must be fitted.
46
2-25/3-32 6-40 15-50/23-65
RNA4906
6303-2RS1 6304-2RS1
+IR30/35/20
6304-2RS1 3206A
6303-2RS1
5206A
– – 10
58-80/86-100 185-125
21307 21310
3307A 3310A
5307A 5310A
15 25
Maximum allowed
TG GS pump size
radial clearances
2-25 to 6-40 0.10 mm
15-50 to 23-65 0.15 mm
58-80 to 86-100 0.25 mm
185-125 0.30 mm
A.0500.501 – IM-TGGS/05.01 EN (03/2013)