Kubota Z231BR-AU Operator'S Manual Download

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6. Install the new filter by hand, turn 3/4 to 1 full turn

after the filter gasket contacts the filter base
surface.

(1) Transaxle
(2) Transaxle oil filter
(3) Filter guard
(4) Hex flange head bolt
(5) Breather port plug

(A) “FRONT”
(B) “OIL LEVEL”

7. Re-install the filter guard (3) with 3 hex head bolts

(4).
Torque bolts (4) to 7.35 N

⋅

m (5.42 lbf

⋅

ft) securely.

8. Repeat steps 2-7 on the opposite side transaxle

drive.

9. Drain old oil filters of all free flowing oil prior to

disposal. Place used oil in appropriate containers
and deliver to an approved recycling collection
facility.

10. Remove the breather port plug (9) from the left side

and right side transaxles prior to filling with oil. This
will allow the transaxles to vent during oil fill.

11. Remove the cap from the transaxle fluid tank

located on the machine frame.

12. Fill with 20W-50 motor oil until oil just appears at

the bottom of the breather port. Install the breather
port plug (5) into transaxle. Torque the plug (5) to
20.34 N

⋅

m (15.0 lbf

⋅

ft).

13. Continue to fill the transaxles through the transaxle

fluid tank until the

“Full Cold”

line is reached on the

transaxle fluid tank.

14. Re-install the transaxle fluid tank cap by hand. Be

careful to not overtighten.

15. Proceed to the purge procedure.

Purging procedures

Due  to  the  effects  air  has  on  efficiency  in  hydrostatic
drive applications, it is critical that it is purged from the
system.
Air  creates  inefficiency  because  its  compression  and
expansion  rate  is  higher  than  that  of  the  oil  approved
for use in hydrostatic drive systems.
These  purge  procedures  should  be  implemented  any
time a hydrostatic system has been opened to facilitate
maintenance or the oil has been changed.
The resulting symptoms in hydrostatic systems may be:
1. Noisy operation.
2. Lack of power or drive after short term operation.
3. High  operation  temperature  and  excessive

expansion of oil.

Before  starting,  make  sure  the  transaxle  is  at  the
proper  oil  level.  If  it  is  not,  fill  to  the  specifications
outlined in this manual.
The  following  procedures  are  best  performed  with  the
machine  drive  wheels  off  the  ground.  Then  repeated
under  normal  operating  conditions.  If  this  is  not
possible, then the procedure should be performed in an
open area free of any objects or bystanders.
1. Disengage the brake if activated.
2. With  the  bypass  valve  open  and  the  engine

running, slowly move the motion control levers in
both forward and reverse directions (5 or 6 times).

3. With the bypass valve closed and the engine

running,  slowly  move  the  motion  control  levers  in
both  forward  and  reverse  directions  (5  to  6  times).
Check  the  oil  level,  and  add  oil  as  required  after
stopping the engine.

4. It may be necessary to repeat Steps 2 and 3 until

all the air is completely purged from the system.
When the transaxle operates at normal noise levels
and moves smoothly forward and reverse at normal
speeds, then the transaxle is considered purged.

2. Changing transaxle fluid

(See Replacing transaxle oil filter on page 60.)

EVERY 500 HOURS

1. Adjusting the electric clutch

This  adjustment  should  be  done  every  500  hours  of
operation  or  annually,  whichever  comes  first.  In  case
the machine is heavily used, air gap settings should be
checked more often.
The  electric  clutch  serves  2  functions  in  the  operation
of the mower:

• Starting and stopping the power flow to the cutter

blades.

• The clutch also acts as a brake to assist in stopping

blade rotation when the PTO is switched off or the
operator presence control is interrupted.

EVERY 400 HOURS

PERIODIC SERVICE

Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU