Changing the TSL
Changing the TSL
Check the condition of the TSL and the level in the res- ervoir every week, minimum. TSL should be changed at least every month.
Part No. 206995 Throat Seal Liquid (TSL) carries resi- due from the pump rod into the reservoir. Discoloration of the TSL fluid is to be expected during normal opera- tion. After some time the TSL will thicken and darken, and must be replaced. Thick, dirty TSL will not pump through the lines and will harden in the pump
How long TSL lasts depends on which chemicals are used, how much is used, what pressure, and condition of the pump seal and rod.
A drop in the level of TSL in the reservoir indicates that the throat packings are starting to wear. Add TSL to the reservoir and keep the level above the Minimum fill line. Monitor the usage and condition of the TSL. If pumped material bypasses the throat packings and enters the TSL reservoir, replace the packings.
To change the TSL:
1. Shut off the pump.
To avoid the buildup of static charge, do not rub the plastic bottle with a dry cloth while it is attached to the pump. Remove the bottle to clean, if needed.
2.Remove and empty the reservoir bottle. Clean any residue.
3.Clean screen (Z) of inlet check valve (53c‡). If check valves are not sealing and dirty TSL is getting into the
NOTE: Order Check Valve Repair Kit 24F404. Kit parts are marked with a symbol, for example (53b‡).
4.Fill the reservoir to the Maximum fill line with Throat Seal Liquid (TSL).
5.Run pump. Each time pump rod reaches bottom of stroke, check that some TSL is pumped from reser- voir through
Outlet Check Valve | Maximum Fill Line |
| |
(53d‡) |
|
53b‡ |
|
| Minimum Fill Line |
Inlet Check Valve (53c‡) 
Z
TI15853b | TI15857 |
FIG. 1. Cutaway of TSL Reservoir, and Fill Lines
6 | 3A0540L |