Toro Groundsmaster 580-D - Auxiliary (Lift;Counterbalance) System Repairs; Steering;Auxiliary Pump Repair (Models 30582 and 30583)

Rev. G
Groundsmaster 580--D Auxiliary (Lift/Counterbalance) System Repairs
Page 4 -- 44.1
Steering/Auxiliary Pump Repair (Models 30582 and 30583)
1. Cap screw (4 used)
2. Shaft seal
3. Pre--load seal
4. Load seal
5. Sealing ring
6. Front wear plate
7. Drive shaft
8. Dowel
9. Rear wear plate
10. Cap screw (3 used)
11. Rear cover (flow divider) assembly
12. Gear plate
13. Idler gear
14. Front body
Figure 39A
5
6
9
10
11
12
13
14
4
7
1
8
2
3
8
5
360 to 380 in--lbs
(40.7 to 42.9 N--m)
360 to 380 in--lbs
(40.7 to 42.9 N--m)
Disassembly
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 or scribe to make a diagonal mark
across the front body, gear plate and rear cover for reas-
sembly purposes (Fig. 39B).
IMPORTANT: Avoid using excessive clamping
pressure on the pump housing to prevent distorting
the housing.
3. Clamp mounting flange of pump in a vise. Loosen all
cap screws.
4. Remove pump from the vise and remove cap
screws.
IMPORTANT: To prevent c omponent damage, never
pry components apart. Light tapping with a plastic
hammer on drive shaft should separate pump.
5. Carefully remove front body. Lift front body straight
up to allow drive shaft and idler gear to remain in rear
cover. Remove front wear plate. Identify intersecting
gear teeth of drive shaft and idler gear with a marker to
ensure proper gear placement during assembly.
6. Carefully remove idler gear and drive gear.
7. Remove gear plate and rear wear plate from rear
cover.
8. Remove and discard pre--load seal, load seal and
sealing rings.
IMPORTANT: Make sure not to damage the counter
bore when removing the shaft seal from the front
body.
9. Remove shaft seal from the front body.
Note: Rear cover assembly includes priority flow di-
vider valve and steering relief valve. These components
are r etained in the cover with tamper proof plugs. Disas-
sembly of rear cover is not recommended.
Inspection
1. Remove nicks and burrs from all parts with emery
cloth.
2. Inspect gear plate for excessive scoring, gouges or
wear. Evidence of damage indicates need for compo-
nent replacement.
3. Inspect front body and rear cover for damage or
wear.