Toro Groundsmaster 4500-D Series Service Manual page 201

Installation (Figure
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
96) (continued)
Position gear pump to the piston (traction)pump so that the gear
pump inlet (suction) ports are facing down.
A case drain exists in the piston (traction) pump and a suction port
is near the input shaft of the gear pump
pump is installed to the piston pump, make sure that plugs placed in
either of these ports are removed. Failure to remove plugs will cause
excessive pressure in the piston pump and damage seals. Also,
before securing gear pump to piston pump, fill piston pump housing
with clean hydraulic oil through case drain hole.
5. Remove caps and plugs from hydraulic lines and fittings. Install hydraulic
lines to gear pump (see
Seal) (page 5–7)).
6. Replace hydraulic oil filter and fill hydraulic reservoir with new hydraulic oil.
g308681
1. Gear pump
2. Piston pump
7. Fill piston pump housing through case drain (90º barbed fitting) with new
hydraulic oil (Figure
have adequate lubrication during initial operation.
8. Prime hydraulic pumps (see
9. Properly fill hydraulic system (see
10. Stop engine and check for hydraulic oil leaks. Check hydraulic reservoir oil
level and adjust if necessary.
IMPORTANT
IMPORTANT
Installing Hydraulic Hoses and Tubes (O-Ring Face
Figure 98
3. Piston pump case drain
98). This will ensure that internal pump components
Priming Hydraulic Pumps (page
Charge Hydraulic System (page
Page 5–99
(Figure 97). Before the gear
5–90)).
Hydraulic System: Service and Repairs
5–95)).