18
6. HIGH DRIVE TO LOW DRIVE
Prior to operating pump, make sure that the shaft rotation, pipe connections, and the relief valve position are in
accordance with the appropriate illustrations shown in Figures 5.5 and 5.6. In order to change the rotation and/or
piping orientation, it may be necessary to remove the piping from the pump or the pump from the mounting.
[Fittings (21) and flange gaskets (22), when provided, can be removed from pump.]
Whenever changing rotation, inspect al parts before reassembly. Replace all worn parts and install new gaskets in
appropriate numbers as removed.
1. Remove coupling or universal joint and drive key (A) from drive shaft (32). Remove all burrs and sharp
edges from drive shaft and keyway.
2. A.) To reverse pump rotation and keep piping arrangement the same, drive shaft (32) position must be
changed. Follow steps 3 – 10.
B.) To reverse pump rotation and leave drive shaft (32) and case (19A, B, C, D, E) in same position;
liquid flow through pump will be reversed. Follow steps 11 – 12.
C.) To change port to opposite side on pumps with a right angle port arrangement and maintain same
pump rotation, follow steps 13 – 20.
D.) To change port to opposite side, maintain same pump rotation and drive shaft (32) in same position;
liquid flow through pump will be reversed. Follow steps 21 – 26.
REVERSE ROTATION, SAME PIPING ARRANGEMENT
3. To reverse pump rotation and keep piping arrangement the same, it is necessary to change from high
drive to low drive or low drive to high drive (3500-3700 series with right angle ports: W to LX, X to LW, Z
to LY, Y to LZ; 4500-4700 series with straight through ports: W to LZ, Z to LW) or vice versa.
4. Remove two washer head cap screws (K) and eight hex head cap screws (L) securing backplate (6A, B)
to case (19A, B, C, D, E) and separate backplate assembly from case assembly. On 3600-4700 “H” and
“BH” pumps, drive gear (34) will pull out with backplate assembly. On “HB”, “SB”, “GHB”, and “BHB”
pumps, drive gear (34) may remain in case assembly.
5. Switch drive gear (34) and idler gear/shaft (35 and 33) positions in case (19A, B, C, D, E).
6. Position appropriate number of case gaskets (20) on case (19A, B, C, D, E) (oil or grease may be used to
hold gaskets in place).
7. Rotate backplate (6A, B) assembly 180 .
8. Slide drive shaft (32) and gear key (B) into shaft hole of drive gear (34).
9. Slide backplate (6A, B) assembly into position and secure.
10. On 3600-4700 series with gear reduction unit, mount oil cup (AB) in top hole in gear case (44) and
petcock (AC) in second hole from bottom.
REVERSE ROTATION, SAME DRIVE SHAFT AND CASE ARRANGEMENT
11. To reverse flow of liquid through pump ports, reverse rotation of drive shaft (32), maintain the original
positions of the drive shaft and case (19A, B, C, D, E) (3500-3700 series with right angle ports: W to X,
LW to LX, Z to Y, LX to LY; 4500-4700 series with straight through ports: W to Z, LW to LZ) or vice versa.
12. On pumps with relief valve, relief valve faceplate (23B or 23C) must be removed, rotated 180 , and
remounted.
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