Finish Thompson AC8/8H - Manual (Page 8)

8
Flush Systems
CAUTION: Some fluids react with water; use compatible flushing fluid.
1. Turn off the pump.
2. Completely close the suction and discharge valves
3. Connect flushing fluid supply to flush inlet valve.
4. Connect flushing fluid drain to flush drain valve.
5. Open flushing inlet and outlet valves. Flush system until the pump is clean.
Section IV – Maintenance
Recommended maintenance schedule
The recommended maintenance schedule depends upon the nature of the fluid being pumped and the specific application. If the
pump is used on a clean fluid, it is recommended that the pump be removed from service and examined after six months of opera-
tion or after 2,000 hours of operation. If the pump is used on fluids with solids, high temperatures or other items that could cause
accelerated wear, then this initial examination should be sooner.
After the initial examination of the internal components and wear items are measured, a specific maintenance schedule can be
determined. For best results, it is recommended that the pump be removed from service annually for examination.
Disassembly
WARNING: Rotating Parts. This pump has components that rotate while in operation. Follow local safety standards for locking
out the motor from the power supply during maintenance or service.
WARNING: Chemical Hazard. This pump is used for transferring many types of potentially dangerous chemicals. Always wear
protective clothing, eye protection and follow standard safety procedures when handling corrosive or personally harmful materials.
Proper procedures should be followed for draining and decontaminating the pump before disassembly and inspection of the pump.
There may be small quantities of chemicals present during inspection.
WARNING: Stop the pump, lock out the motor starter, close all the valves that are connected to the pump, and drain/decon-
taminate the pump.
WARNING: The pump must be thoroughly flushed of any hazardous materials and all internal pressure relieved prior to opening
the pump. Allow the pump to reach ambient temperatures prior to performing maintenance.
Seal Replacement & Disassembly
1. Disconnect power. Remove electrical wiring.
2. Close the suction and the discharge valves. Disconnect the piping. Remove any mounting bolts.
3. For AC6 pumps - Remove the v-clamp (item 2) and the impeller housing (item 1), first apply a thread lubricant to the threaded rod
portion of the v-clamp then remove the nut. Remove the v-clamp, the housing, and the o-ring (item 3).
For AC8 pumps - Remove the 8 housing bolts and all the hardware (items 15, 16, 17, 18). Remove the impeller housing (item 1)
and the o-ring (item 3).
4. Place a screwdriver in the motor fan to prevent rotation and remove the self-sealing bolt (item 6).
Note: Do not reuse the self-sealing bolt.
5. Remove impeller (item 4), rotating seal component, seal spring and seal spring retainer.
Discard seal components after removal.
(See Figure 2).
6. Remove back head assembly (item 7) and press out the stationary seal component.
Discard stationary seal component after removal.
Fig 2