Graco 26R310, Repair And Parts Manual

Page: 23 / 82

Repair
3A8501A 23
Change ISO Pump Throat Seal
Lubricant (TSL) Fluid
Check the condition of the TSL fluid daily. Change the
TSL fluid if it becomes a gel, its color darkens, or it
becomes diluted with isocyanate.
Gel formation is due to moisture absorption by the TSL
fluid. The interval between changes depends on the
environment in which the equipment is operating. The
TSL fluid system minimizes exposure to moisture, but
some contamination is still possible.
TSL fluid discoloration is due to continual seepage of
small amounts of isocyanate past the pump packings
during operation. If the packings are operating properly,
TSL fluid replacement due to discoloration should not
be necessary more often than every 3 or 4 weeks.
To Change TSL Fluid:
1. Follow the Pressure Relief Procedure on page 19.
2. Lift the TSL fluid reservoir (R) out of the bracket and
remove the reservoir from the cap. Hold the cap
over a suitable waste container and flush
contaminated fluid out of the lines by placing the
strainer in the new fluid and dispense contaminated
fluid through the return line into the waste
container.
3. Manually cycle the peristaltic pump (PP) in the
diagnostic screen until all contaminated TSL fluid is
removed from the system.
4. Drain the reservoir and flush it with clean TSL fluid
or replace it with a new reservoir.
5. When the TSL fluid system is flushed clean, fill it
with fresh TSL fluid.
6. Thread the reservoir onto the cap (H) assembly and
place it in the bracket.
7. Verify the TSL fluid pump is operating correctly by
feeling the pulsation in the return hose during
normal proportioner pump operation.
ti40183a
PP
R