Gear Pump Service (Casappa Gear Pump) - Toro Workman 3000 Series Service Manual

Gear Pump Service (Casappa Gear Pump)

3
2
1
1. Retaining ring
2. Shaft seal
3. Front cover
4. Dowel pin
5. O- -ring (2 used)
6. Back- -up seal
Disassembly (Fig. 23.1)
1. Plug pump ports and clean the outside of the pump
thoroughly. After cleaning, remove plugs and drain any
oil out of the pump.
2. Use a marker to make a diagonal line across the
front thrust plate, body and rear flange for assembly pur-
poses (Fig. 23.2).
IMPORTANT: Prevent damage when clamping the
gear pump in a vise; clamp on the front thrust plate
only. Also, use a vise with soft jaws.
3. Clamp front thrust plate of pump in a vise with soft
jaws with the shaft end down.
4. Loosen, but do not remove, screws that secure rear
flange to pump.
5. Remove pump from the vise and position pump so
that the shaft end is facing down. Remove screws.
6. Carefully lift rear flange from body.
7. Carefully remove body. Lift body straight up to re-
move. Make sure the rear thrust plate remains on the
drive and idler gear shafts. Locate and retrieve dowel
pins.
Hydraulic System
7
6
8
7. Pressure seal
8. Front thrust plate
9. Drive shaft
10. Idler shaft
11. Body
12. Rear thrust plate
4
14
13
9
4
5
12
10
Figure 23.1
IMPORTANT: Note position of the open and closed
side of the thrust plates before removing. Also,
identify thrust plates (front and rear) with a marker
for proper assembly.
8. Carefully remove rear thrust plate, idler shaft, drive
shaft and front thrust plate from the front cover.
9. Remove and discard O--rings, back--up seals and
pressure seals from pump.
Page 9 - - 29.1 Rev. D
16
15
5
11
220 in- -lb
(25 N- -m)
13. Pressure seal
14. Back- -up seal
15. Rear flange
16. Lock washer (4 used)
17. Screw (4 used)
MARKER LINE
Figure 23.2
Workman 3000/4000 Series
17