 |
|
 |
Begin OCR Text:
j __ _ ____ ________ _ _ _
__
_
P 12O, P 18OO
ferent depending on whether the overdrive is of
early or late production.
When an early production overdrive is disengaged, _
_he va_ve ,od ,s _owered so that the baII va1ve
c_oses off the connection between the pump and _
cylinders. Instead, the passage in the valve rod
is opened and oil from the cylinders can flow
through the passage and out into the gearbox
housing, see Il, Fig. 5. The cone clutch is then
pressed backwards by the spring_
On the late production overdrive, disengagement
is done in more or less the same way. The differ- _ vo,,o
ence is that the passage from the pumP oPens I _L _
out under the ball valve, so that even oil from the '
pump can flow through the valve rod back to the Fig. _. Controt v8lve. $arly produ_tion _
gegrboK houg_ing. Th_is means that the pump opera- .
tes with a Iower loading in the d_rect drive posi-
, fion, see Fig. 6.
'
i' On late production, the eKcess oil from the pump
._
'is usgd for lubricating the planetary gear_ The _
oil flows through passages ìn the front part of the
ove_drive housing and input shaft (ma'inshaft of A
' B
gearboK) to the uni-dìrectional roller clutch and
needle bearing for the shaft. The oil is then caught
up by a pIate and fed back to the gearboK housing
_ via the planet gears, see Fig. 7_
_'_ ' ' _ I II ''j'''
Fig. 6. Control valve. Iate produ_tion
_. Ovgrdrivg position A To hydrauliC cylinder _
_ Il. Direct drive poS_t_on B From oil pUmp _
6 _ _ i
__
Fig. 4. Hydrauli_ 6y6tem. Iate productio_ Ii
_. HydrQul_c cylinder 4. OìI pump
and piston 5, Relief valve
2. O__ gtrainer 6. Control valve i
3 D,,,, p_,g Fig. 7. Force_teed lubrication
4-2
|
