Gradall 534B (9020-7317) Service Manual - Manual (Page 144)

HOW THE UNITS OPERATE
The transmission and hydraulic torque portion of the power train enacts an important role in transmitting
engine power to the driving wheels. In order to properly maintain and service these units it is important
to first understand their function and how they operate.
The transmission and torque converter function together and operate through a common hydraulic system.
I t i s n e c e s s a r y t o c o n s i d e r b o t h u n i t s i n t h e s t u d y o f t h e i r f u n c t i o n a n d o p e r a t i o n .
To supplement the text below, and for reference use therewith, the following illustrations are provided:
B a s i c D e s i g n
C o n v e r t e r G r o u p
C o n v e r t e r a n d T r a n s m i s s i o n C a s e G r o u p
Tw o a n d T h r e e S p e e d G e a r a n d C l u t c h G r o u p
C l u t c h G r o u p
C o n t r o l Va l v e A s s e m b l y
P a r k i n g B r a k e G r o u p
E x t e r n a l P l u m b i n g D i a g r a m
A s s e m b l y I n s t r u c t i o n s
Ty p i c a l 3 S p e e d 1 8 0 0 0 C r o s s S e c t i o n
Ty p i c a l Tw o a n d T h r e e S p e e d P o w e r F l o w
P r e s s u r e C h e c k P o i n t s
C l u t c h a n d G e a r A r r a n g e m e n t
Tr a n s m i s s i o n To E n g i n e I n s t a l l a t i o n P r o c e d u r e
The HR Model consists of a torque converter and powershifted transmission in one package mounted directly
to the engine.
The shift control valve assembly is mounted directly on the side of the converter housing. The function of
the control valve assembly is to direct oil under pressure to the desired directional and speed clutch. A pro-
vision is made on certain models to neutralize the transmission when the brakes are applied. This is accom-
plished through use of a brake actuated shutoff valve. The speed and direction clutch assemblies are mounted
inside the transmission case and are connected to the output shaft of the converter by direct gearing. The
purpose of the speed or directional clutches is to direct the power flow through the gear train to provide
the desired speed range and direction.
Fig. A
Fig. B
Fig. C
Fig. D
Fig. E
Fig. F
Fig. G
Fig. H
Fig. I
Fig. J
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