Gearbox Service Kit
Z Master 320/350 Series 48 Mower
Part No. 105–6172
Part No. 105–6178
Installation Instructions
Loose Parts
Note: Use the chart below to identify parts for assembly.
DESCRIPTION QTY. USE
Form No. 3327–295
Gearbox
Screw
Washer
Spring Pin
Decal 1 Installing the Decal
Blade Bolt, Lefthand thread 1 Installing the Blade Bolt
Identifying the Mowers
There are two types of mowers that this gearbox can be
installed on. There is the Z320 Series and the Z350 Series.
Identify the mower type you have in figures 1 and 2.
1
8
8
1
Installing the Gearbox
Z350 Series Mower
If you have a mower, with height–of–cut posts, as shown
in figure 2 then proceed to page 2 for installation
instructions.
2
Z320 Series Mower
If you have a mower, with height–of–cut brackets, as
shown in figure 1 then proceed to page 2 for installation
instructions.
2
1
1
2
m-4978
Figure 1
1. Z320 Series mower 2. Height–of–Cut Brackets
2001 by The Toro Company
8111 Lyndale Avenue South
Bloomington, MN 55420-1196
Figure 2
1. Z350 Series mower 2. Height–of–Cut Posts
1
m–4857
All Rights Reserved
Printed in the USA
Installing the Z320 Series
Installing the Z350 Series
Gearbox
Note: Each gearbox assembly has three individual fluid
boxes.
Removing the Gearbox
1. Remove blades and blade retainers from beneath
mower. Save the square key from each gearbox output
shaft for use with the new gearbox.
2. Remove any guards connected to the existing gearbox,
and disconnect drive shaft.
3. Remove and discard the existing gearbox mounting
bolts (8).
4. Remove existing gearbox from top of mower.
Installing the Gearbox
1. Place new gearbox on mower. The vertical output
shafts should be centered in the two cone–shaped
recesses in the top of the mower (Fig. 3).
2. Insert bolts, with washers, through mounting brackets
and into gearbox mounting holes (Fig. 3). Torque
mounting bolts to 260 ± 25 in.–lbs.
Gearbox
Note: Each gearbox assembly has three individual fluid
boxes.
Removing the Gearbox
1. Remove blades and blade retainers from beneath
mower. Save the square key from each gearbox output
shaft for use with the new gearbox.
2. Remove any guards connected to the existing gearbox,
and disconnect drive shaft.
3. Remove and discard the existing gearbox mounting
bolts (8).
4. Remove existing gearbox from top of mower.
Installing the Gearbox
1. Place new gearbox on mower. The vertical output
shafts should be centered in the two cone–shaped
recesses in the top of the mower (Fig. 4).
2. Insert bolts, with washers, through mounting brackets
and into gearbox mounting holes (Fig. 4). Torque
mounting bolts to 260 ± 25 in.–lbs.
Important Torque mounting bolts to 260± 25 in.–lbs.
Bolts have pre–applied thread locker.
3. Connect driveshaft to gearbox (use new spring pin
included in kit). Attach any guards that were removed
for assembly, and connect blade assemblies to new
gearbox.
4
1
5
2
3
m–4629
Figure 3
1. Gearbox
2. Bolt
3. Washer
4. Pin
5. Decal
Important Torque mounting bolts to 260 ± 25 in.–lbs.
Bolts have pre–applied thread locker.
3. Connect driveshaft to gearbox (use new spring pin
included in kit). Reattach any guards that were
removed for assembly, and connect blade assemblies
to new gearbox.
4
1
5
2
m–4957
1. Gearbox
2. Bolt
3. Washer
3
Figure 4
4. Spring P i n
5. Decal
2
Installing the Decal
A new decal has been provided to replace the existing
gearbox lubricant decal on the mower. This is for both
Z320 and Z350 series gearboxes.
1. Thoroughly clean mower in area of lubrication decal.
Install new decal over the existing decal (Fig. 3 and 4).
Installing the Blade Bolt
A new blade bolt (lefthand threaded) has been provided to
replace the existing right hand blade bolt.
Change fluid:
• after initial 100 operating hours.
• each year before storage.
Fluid Type: 85W–140 Mobilube or equivalent
Important Do not mix fluids.
Gearbox Capacity: 5–1/2 oz. (129.6 ml) each box
16–1/2 oz. (488 ml) for all three
boxes
Check fluid: After every 100 operating hours.
Note: Determine the left and right sides of the machine
from the normal operating position.
Refer to the operator ’s manual for the correct procedure of
installing the blades and blade bolt.
Servicing the Gearbox Fluid
Note: Make sure to use the correct fluid for your machine.
There are two different types of fluid.
Gearbox Fluid for all Mowers
letters TE in the model number.
The following is an exmaple of a model number without
the letters TE.
Model No. 74195—210000001 and Up
Change fluid:
• after initial 100 operating hours.
Note: Fluid will not have to be changed again after initial
100 hour fluid change.
Fluid Type: Automatic Transmission Fluid
(Dexron III or equivalent)
without
the
Changing the Gearbox Fluid
The gearbox fluid must be changed after first 100
operating hours. Change all three gearboxes.
Important Do not mix fluids.
1. Warm the fluid in gearbox by running the mower
mower for a few minutes.
2. For the 320 Series remove footrest and two shields that
cover gearbox and PTO shaft (Fig. 5).
3. For the 350 Series remove the mower footrest and
guards as necessary. This is not valid for all 350 Series
models.
1
3
4
2
3
Important Do not mix fluids. Use only Automatic
Transmission Fluid.
Gearbox Capacity: 5–1/2 oz. (129.6 ml) each box
16–1/2 oz. (488 ml) for all three
boxes
Check fluid: After every 100 operating hours.
Gearbox Fluid for all Mowers
with
the
letters TE in the model number.
The following is an exmaple of a model number with the
letters TE.
Model No. 74804TE—220000001 and Up
Figure 5
1. Gearbox Shield
2. PTO Shield
4. Raise mower to upright position.
5. With mower raised, remove plug on the bottom side of
the gearbox. Let fluid fully drain into a pan. (Fig. 6).
6. Reinstall the bottom plug into the gearbox using pipe
sealant on threads (Fig. 6).
7. Remove the top plug to fill gearbox (Fig. 6).
3
3. Screw
4. Nut
m-4979
8. Fill gearbox with 5–1/2 ounces (129.6 ml) of gearbox
fluid. For correct fluid; refer to Gearbox Fluid, on
page 3.
9. Reinstall the top plug into the gearbox using pipe
sealant (Fig. 6).
10.Repeat for remaining gearboxes.
2
2
3
1
4
3
1
4
M-4531
Figure 6
1. Gearbox
2. Top plug
3. Side plug
4. Bottom plug
3
Checking the Gearbox Fluid
The gearbox fluid must be checked after every 100
operating hours. Check all three gearboxes.
1. Warm the fluid in gearbox, by running the mower
mower for a few minutes.
2. Raise mower to upright position.
3. Remove plug on the side of the gearbox. The fluid
level must be up to side hole in gearbox (Fig. 6).
4. If needed, fill fluid into top hole until it runs out the
side hole in gearbox. Gearbox is full when fluid runs
out the side hole (Fig. 6). For correct fluid; refer to
Gearbox Fluid, on page 3.
Important Do not mix fluids.
5. Reinstall the top and side plugs into gearbox using
pipe sealant on threads (Fig. 6).
6. Repeat for remaining gearboxes.
4
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