Viking Pump TSM211: F-G 724/4724 - Manual (Page 7)

SECTION TSM 211 ISSUE D PAGE 7 OF 8
fIgURE 8
VALVE - G SIZE
VALVE - LIST Of PARTS
1. Valve Cap 6. Valve Body
2. Adjusting Screw 7. Valve Spring
3. Lock Nut 8. Poppet
4. Spring Guide 9. Cap Gasket
5. Bonnet
PRESSURE RELIEf VALVE
INSTRUCTIONS
1. Remove valve cap.
2. Measure and record the length of extension of the
adjusting screw, See (A) figure 9.
3. Loosen the lock nut and back out adjusting screw until
spring pressure is released.
4. Remove bonnet, spring guide, spring and poppet from
valve body. Clean and inspect all parts for wear or
damage and repair or replace as necessary.
Install three rings of packing with the joints staggered.
Loosen the packing gland nut by turning counterclockwise
viewing from the shaft end. Install the split packing gland
halves and slide packing gland retainer washer into place.
Install internal retaining ring.
The packing is now ready for adjustment. Since the stainless
steel pump shaft has a tendency to become hot when
packing is over-tightened, the packing must be carefully
adjusted. During first few days, tighten packing slowly
allowing adequate leakage as packing “runs-in”. The packing
when properly adjusted must have slight leakage to achieve
proper operation and life. After initial adjustments occasional
adjustment will be required during operation.
To set the proper running end clearance, rotate end
cap in the opposite direction (counterclockwise) three
notches which is equivalent to .003 end clearance. Each
notch represents .001 end clearance.
2. Retighten setscrew locking the end cap in place.
3. REASSEMBLY Of SERIES 724 (Refer to fig. 4).
With the pump in a vertical position, install the packing
retainer washer in the bottom of the stuffing box and
install three rings of packing. It is a good practice to install
a new set of packing. Install three rings of packing with
the joints staggered. Install the two split packing gland
halves. Place the packing gland retainer washer on the
split packing gland halves and assemble the packing
gland nut to the casing. (Skip to step number 4).
REASSEMBLY Of SERIES 4724 (Refer to fig. 5).
Assemble mechanical seal with installing clips in place.
Check shaft step to be sure it doesn’t have any burrs.
DO NOT BREAK EDgE ON STEP SINCE fULL
EDgE IS REQUIRED TO SUPPORT THRUST Of
ROTOR SHAfT. Coat the inside of the rotary member
with light oil.
Place the rotary member on the shaft and slide over
the bearing step. THIS SHOULD PRACTICALLY fALL
INTO PLACE. NO fORCE SHOULD BE USED. As
shown in figure 6 place the wire spanner wrench under
the rotary member and place the seal seat above. Push
the seal seat against the rotary member until installation
clips are loose and can be removed. Remove the wire
spanner wrench. Remove the seal seat and install the
PTFE gasket and assemble the seal seat in the casing.
Place the gasket in the packing gland and tighten gland
to the casing. Using an Allen wrench tighten the two small
setscrews on the mechanical seal through the 1/8” pipe
access hole. Replace the 1/8” socket head pipe plug.
4. (Refer to fig. 7). Place the two conical spring washers
with the I.D.’s in contact, (the O.D.’s will then be
separated) into the thrust bearing area of the bracket.
Next place the double row ball bearing and the end cap
containing a lipseal into position. Tighten the end cap
by hand until resistance is felt, then tighten half turn
additional.
5. Place a bearing spacer collar on the shaft with the
bevel on the O.D. pointing toward the drive end. Place
the casing and shaft assembly in the bracket assembly
and tighten with the two bracket capscrews. Insert the
second bearing spacer collar (beveled edge first) over
the end of the shaft and against the ball bearing.
Place the bearing locknut on the shaft and tighten. Use
a suitable wrench on the flat of the shaft to keep it from
turning.
IMPORTANT: Adjust end clearance before operating
pump.
1. The two conical spring washers produce a thrust
load on the outer race of the double row ball bearing
pushing it towards the head. End clearance adjustments
are made by rotating the end cap in a clockwise or
counterclockwise motion.
To set the end clearance rotate the end cap using the wire
spanner wrench in a clockwise direction while viewing
from the shaft end, until noticeable drag occurs while
turning the shaft. This produces zero end clearance.
END CLEARANCE ADJUSTMENT
INSTALLATION Of NEW PACKINg