Viking Pump TSM270.1: RL 16 and 25 Standard - Manual (Page 9)

SECTION TSM 270.1 ISSUE A PAGE 8 OF 12 SECTION TSM 270.1 ISSUE A PAGE 9 OF 12
1. If the casing bushings are worn or grooved, install
new bushings. Refer to INSTALLATION OF PEEK®
BUSHINGS, page 10.
2. Assemble the lobes and shafts. Insert the keys in the
shafts, install the lobes and secure in place with the
snap rings. The flat side of the snap ring should face the
lobe.
3. Coat the bottom casing bushing bore with light oil, then
gently slide the driven lobe/shaft assembly (shorter shaft)
into place. Hold the shaft as horizontal as possible when
installing; this helps to avoid damaging the bushing
when the step on the shaft slides into the bushing bore.
Slide the lobe/shaft assembly all the way into the casing.
Repeat this process with the driver lobe/shaft assembly,
again being careful not to damage the bushing on the
shaft’s multiple steps.
4.Establish the initial shaft placement to accept the timing
gears. Position the shafts so the driver timing gear
keyway will be located at 6 o’clock and the driven at 3
o’clock as viewed from the input end of the shaft.
5. Install the head with the capscrews – this is a temporary
installation, but capscrews must be tight to properly set
running clearance in a later step. Make sure the head is
positioned properly over the locating pin.
6. To install the cartridge mechanical seal, lubricate the
seal ID and pump shaft with an appropriate lubricant.
Slide the cartridge mechanical seal onto the shaft until
the gland contacts the stuffing box face.
7.Secure the seal glands to the casing with washers and
capscrews.
NOTE: General installation instructions for other sealing
options are located on page 6.
8. Assemble the bracket to the casing, and torque the
capscrews evenly per Table 2.
9. Refer now to Figure 8 on page 8. The bearing housing
should already be assembled; if not see BEARING
HOUSING ASSEMBLY. Install the O-rings onto the
bearing housings; apply a lubricant to the O-ring to
ease installation. Pack the bearings with a heavy-duty
multi-purpose grease. Thread the bearing housing into
the bracket on the lower shaft. Repeat for the upper
bearing housing. Rotate each bearing housing assembly
clockwise until the lobes hit the pump head, then back
them off 1⁄4 turn.
10.Apply a liberal coating of anti-seize or lubricating
compound on the area of the shaft underneath the timing
gear. Insert the keys into the shaft keyways. Install the
timing gears, positioned with arrows meshed as shown
in Figure 9. Rotate the driver shaft by hand, to be sure
the timing gears are properly aligned. If not, check the
arrows again.
11.Remove the pump head.
12.Adjust the bearing housing assembly to position the
lobes slightly extended (approximately 1/8 inch )beyond
the front face of the casing. Place a wooden block or
brass bar in between the lobes to block rotation. Install
lockwashers and locknuts and tighten with the spanner
wrench. Locknuts must be tightened to 200 ft-lbs torque.
This torque is required to obtain the proper bearing
preload and ensure the bearing/timing gear assembly
is locked securely on the shaft. This torque can be
simulated by applying approximately 200 pounds of
weight with a one foot wrench or 100 pounds of weight
with a two foot wrench.
13.Set the end clearance; refer to End Clearance Adjustment
on page 8.
14. Inspect the lipseal in the gear case cover and replace
if needed. Put the O-ring in place, then install the gear
case cover by visually centering the lipseal over the
shaft. Install the capscrews, and torque evenly. Fill with
gear oil to the bottom of the fill hole, approximately 15
ounces.
15. Place the O-ring and reinstall the head. Torque the head
capscrews per Table 2.
16. Evenly torque the seal gland capscrews per Table 2
which is located on page 3.
17. Tighten the setscrews in each seal. For optional seals-
remove the setting clips.
18.Replace the cover plate and capscrews on the bracket.
FIGURE 9
WARNING:
Do not use the circulation tubing to lift the pump or
casing. Make sure the casing is secured to a work
bench or other stable work surface before working
on the pump.
PUMP ASSEMBLY