Hydro-Gear 310-1500, Руководство по обслуживанию и ремонту

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2
-1500/-1700 IHT
INTRODUCTION
The purpose of this manual is to provide use-
ful information for servicing the Hydro-Gear
®
-1500/ -1700 Integrated Hy dro stat ic Transaxles
(IHT). This man u al includes transaxle gen-
eral de scrip tion, hy drau lic sche mat ic, tech ni cal
spec i
fi ca tions, product iden ti fi ca tion, safe ty,
trou ble shoot ing, main te nance, and re pair pro-
ce dures.
The transaxle normally will not require servic-
ing during the life of the vehicle in which it is
in stalled. Should other ser vic ing be required,
the transaxle will need to be thoroughly cleaned
be fore be gin ning most procedures.
Please refer to the instructions titled “How to
Use This Man u al” in the Repair Section for an
ex pla na tion of the lay out of the disassembly,
in spec tion, and re as sem bly portions of this
manual.
GENERAL DESCRIPTION
The -1500/-1700 series transaxles are self con-
tained units de signed for the transfer and con-
trol of pow er. They provide an in
fi nite ly vari able
speed range be tween zero and max i mum in
both forward and re verse modes of op er a tion.
The transaxle uses a variable displacement
pump with a max i mum displacement of 10
cc per rev o lu tion, and motor with a
fi xed dis-
place ment of 21cc per rev o lu tion. The vari able
dis place ment pump fea tures a cradle swash-
plate with a di rect-pro por tion al displacement
con trol. Re vers ing the di rec tion of the swash-
plate re vers es the fl ow of oil from the pump
and thus re vers es the di rec tion of the motor
output ro ta tion. The pump and motor are of the
axial piston de sign and utilize spherical nosed
pistons which are held against a thrust race by
internal com pres sion springs.
The -1500/-1700 se ries transaxles have a self
con tained
fl u id sup ply and an in ter nal fi l ter. The
fl uid is drawn through the in ter nal res er voir and
feeds the fi xed dis place ment gerotor charge
pump. Ex cess fl u id in the charge circuit is dis-
charged over the charge re lief valve and dumps
back to case. Charge check valves in the cen ter
section are used to control the make up
fl ow of
the fl uid to the low pres sure side of the loop.
The transaxle is fi lled and tested at the factory
and should not re quire fl uid or fi lter changes
un less the fl uid be comes con tam i nat ed.
A cam style, block lifting bypass is utilized in the
-1500/-1700 se ries to per mit mov ing the ve hi cle
for a short dis tance at a max i mum speed of 2
m.p.h. (3.2 km/hr) with out start ing the en gine.
WARNING
Actuating the bypass will result in the
loss of hy dro stat ic braking capacity. The
machine must be sta tion ary on a level
surface and in neutral when actuating
the bypass.
The -1500/-1700 series transaxles uti lize an
in-line
fl oat ing disc brake con trolled by a "cam"
style ac tu at ing arm.
SECTION 1. DESCRIPTION AND OPERATION