User's Manual

Maintenance
3A2175A 47
6. Open the fluid inlet valve, ensure that there are no
leaks, and wipe the equipment clean. Proceed with
operation.
IsoGuard Select
™
System
(Not included on HFRS systems)
NOTE: The IsoGuard Select system is included on all HFRL
systems. It is available separately for HFRS systems as kit
24M154.
Check the condition of the A (Red) pump IsoGuard
Select fluid daily. Change the fluid if it becomes a gel, its
color darkens, or it becomes diluted with isocyanate.
Gel formation is due to moisture absorption by the pump
IsoGuard Select fluid. The interval between changes
depends on the environment in which the equipment is
operating. The pump lubrication system minimizes
exposure to moisture, but some contamination is still
possible.
Fluid discoloration is due to continual seepage of small
amounts of isocyanate past the pump packings during
operation. If the packings are operating properly, Iso-
Guard Select fluid replacement due to discoloration
should not be necessary more often than every 3 or 4
weeks.
To change pump IsoGuard Select fluid:
1. Perform Pressure Relief Procedure on page 38.
2. Remove fittings from IsoGuard Select fluid cylinder
inlet and outlet ports. Keep supply tube (ST), return
tube (RT), and leak management tube (LT) con-
nected to the fittings.
3. Carefully place ends of tubes with fittings still con-
nected into an empty pail to drain IsoGuard Select
fluid.
4. Lift the IsoGuard Select fluid reservoir (LR) out of
the bracket (RB) and remove the container from the
cap. Holding the cap over a suitable container,
remove the inlet check valve and allow the IsoGuard
Select fluid to drain. Reattach the check valve to the
inlet hose. See F
IG. 18.
5. Drain the reservoir and flush it with clean IsoGuard
Select fluid.
6. When the reservoir is flushed clean, fill with fresh
IsoGuard Select fluid.
F
IG. 17. Fluid Inlet Strainer
59g*
59h
59j
59k
ti9886a1
59d