Tennant ATLV 4300 Service Manual page 135

2000 Series Disc Valve Motors
Reassembly
Check all mating surfaces. Replace any parts that have scratches or
burrs that could cause leakage. Clean all metal parts in clean solvent.
Blow dry with air. Do not wipe dry with cloth or paper towel because
lint or other matter can get in the hydraulic system and cause damage.
Do not use a coarse grit or try to file or grind these parts. Check
around the keyway and chamfered area of the shaft for burrs, nicks or
sharp edges that can damage the seals when reassembling the bearing
housing.
Note: Lubricate all seals (prior to installation) with petroleum jelly such
as Vaseline. Use new seals when reassembling this motor. Refer to
parts list (6-129) for proper seal kit number.
21 Use a press to install exclusion seal in outer bore of bearing
housing. Lip of seal must face outward. See Figure 11. If a press is
not available use a plastic or rubber hammer, being careful not to
damage or cock seal in the bore.
Shaft Seal
Back-up
Washer
Exclusion
Seal
22 Place back-up washer into seal bore. Place shaft seal onto
installation tool (600496) and press seal into seal bore of the
housing.
23 Clamp housing in vise, see Figure 1.
24 Place protective bullet (see note below) over shaft. Apply
petroleum jelly to inside diameter of dust and shaft seal. You may
need a press to install shaft and bearing assembly. Do not distort
shaft seal. Damage to this seal will cause leakage.
Note: Bullet (600465), for 1inch dia. shafts, available— by special
order. Use tape over other shafts to prevent cutting the seals.
25 Apply petroleum jelly to the 76,0 [3.00] diameter seal. Install
seal into the bearing housing.
Shaft Face
Shaft Face
Seal
Wear Plate
Seal
Shaft and
Bearing
Assembly
Figure 11
26 Alignment studs can be very helpful in reassembly of the motor.
See special tool listing page 2. If you use studs, install 2 studs
diagonally opposed in the bearing housing.
27 Install the shaft face seal in the wear plate as shown in Figure 11.
Do not distort seal.
28 Install the wear plate, see Figure 11.
29 Apply a light film of petroleum jelly to the 76,0 [3.00] diameter seal
and install seal in the wear plate.
30 Install the drive into the output shaft.
31 Align the notch on the outside of the Geroler with the notch on the
wear plate. Install the Geroler against the wear plate. Be sure to retain
the rollers in the outer ring if they are loose.
32 Install the valve drive in the Geroler.
Note: Installation at this time involves 3 steps in the timing of the
motor. Timing determines the direction of rotation of the output shaft.
Timing parts include:
1. Geroler
2. Valve Drive
3. Valve Plate
4. Valve
Geroler Valve Plate
Valve
Drive
Drive
Largest Alignment
Open Pocket Ref. Only
Figure 12 Timing Alignment
Timing Step # 1 — Locate the largest open pocket in the Geroler and
mark it on the outside edge of the Geroler.
33 Apply a light film of petroleum jelly to the 76,0 [3.00] diameter
seal. Install seal in groove of valve plate.
Valve
Rotate
Valve
Clockwise
1/2 tooth max.
to Engage Spline
Anyone of
6 Ports Open
to Ouside of Vave
5