Thrush TV2g In-Line Centrifugal Pumps - Manual (Page 4)

VACUUM PRIMING
Vacuum priming consists of removing air from the pump casing and suction piping and drawing
liquid into them by means of a vacuum-creating device. The types of vacuum equipment range
from a simple hand pump to a complex central priming system. The specific priming
requirements will govern what type of vacuum primer is used.
STARTING THE PUMP
The discharge-isolating valve should be partially closed when the pump is started in order to
avoid possible water hammer and initial power draw. As soon as the pump is up to operating
speed, the discharge-isolating valve should be opened to the desired position. The motor should
turn clockwise when viewed from the motor end and counter-clockwise when viewed from the
casing end.
MAINTENANCE
It is doubtful a Thrush pump will ever require complete disassembly. Generally, only certain
components need be disassembled to accomplish inspection or repair.
DISASSEMBLY
Since the Thrush TV2g pump is a back pull out design, it is unnecessary to disconnect piping or
casing for service. All service and maintenance can be performed by disconnecting the electric
service and removing the bracket motor assembly from the casing.
1. Close suction and discharge valves.
2. Break electrical connections to prevent drive unit from being energized during
disassembly.
3. Unscrew pipe plugs (31) from suction and discharge ends of casing (28) and bottom of
casing (28) to drain pump.
4. Remove all relief, cooling, flushing or drain lines, if present, from the pump.
5. Disconnect wiring at the motor.
6. Remove capscrews (30) from bracket (15) and lift motor bracket assembly from casing
(28). Remove casing gasket (27).
7. Unscrew impeller bolt (35) and remove impeller washer (34), taking care not to damage
gaskets (33).
8. Slide impeller (37) and impeller key (14) from the shaft, again taking care not to damage
sleeve gasket (23).
9. Remove impeller key (14).
10. Wear ring (39) is pressed into casing with an interference fit and must be removed with a
puller if replacement is necessary. (The wear ring is an optional item on the pump.)
11. If replacing seal cartridge assembly (19, 20, 21 & 22), slide seal cartridge assembly off
the shaft.