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Changing the TSL
6 3A0540L
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 wet-cup.
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.
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 wet-cup, replace the check valves (53c,
53d). See F
IG
. 1.
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 wet-cup and back to reservoir.
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.
F
IG
. 1. Cutaway of TSL Reservoir, and Fill Lines
TI15853b
Z
TI15857
Maximum Fill Line
Minimum Fill Line
53b
‡
Inlet Check Valve
(53c
‡)
Outlet Check Valve
(53d
‡)