Branson F42r - Page 284

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42hW-201601
CHAPTER 6 HYDRAULIC SYSTEM 3015R(h)/3515R(h)/4015R(h)/F36R(h)/F42R(h) TRACTOR
HST MODEL
2
5
6
11
9
7
8
10
1
12
3
13
4
.BJOMJOF1VNQ
4UFFSJOHMJOF1VNQ
4VDUJPOMJOF
A42W603B
(1) PST cylinder
(2) Hydraulic pump (7cc)
(3) Hydraulic pump (13cc)
(4) PST valve
(5) Front outlet valve
 (6)Hydrauliclter
(7) PTO valve
(8) Rear relief valve
(9) Hydraulic cylinder case
(10) Control valve
 (11)HSTlter
(12) Oil cooler
(13) HST
For the HST model, the hydraulic circulation circuit of the primary gear pump (13 cc/rev.) is the same to the
one for the mechanical model. However, these two models have different methods for hydraulic pressure
delivery of the secondary gear pump (7.0 cc/rev.).
Hydraulic oil supplied from the secondary gear pump is used to operate the PST valve and PTO valve. Then,
itiscarriedfromthePTOvalveintotheHSTltertobeltered.Afterltered,itisledintotheoilcoolertobe
cooleddowntoasufcientlevelbeforeitisdeliveredtotheHSTforHSToperation.