Kubota Z411 Operator'S Manual Download

Page: 70 / 90

NOTE :

• Always replace the filter when performing

any internal maintenance to the transaxle.

4. After the oil has drained, inspect all parts for

excessive wear or damage. Replace if necessary.

5. Wipe off the filter base surface and apply a film of

new oil to the gasket of the new replacement filter.

6. Install the new filter by hand and 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. Reinstall 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 the old oil filters of all free flowing oil prior to

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

10. Remove the breather port plug (5) 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 appears just at

the bottom of the breather port. Install the breather
port plug (5) into the 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. Reinstall the transaxle fluid tank cap by hand. Be

careful not to overtighten.

15. Proceed to the purge procedure.

Purging procedures

Due  to  the  effects  air  has  on  efficiency  in  hydrostatic
drive  applications,  it  is  critical  to  purge  it  from  the
system.
Air  creates  inefficiency  because  its  compression  and
expansion  rate  is  higher  than  the  one  of  the  oil
approved for use in hydrostatic drive systems.
These purge procedures should be performed anytime
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  oil  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,  repeat
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 rearward 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 rearward 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 rearward at normal
speed, then the transaxle is considered purged.

2. Changing the transaxle fluid

(See Replacing the transaxle oil filter cartridge on page
64.)

EVERY 500 HOURS

1. Replacing the spark plug

(See Checking the spark plug on page 59.)

EVERY 400 HOURS

PERIODIC SERVICE

Z400