Toro 10176SL Service Manual Models 30448 30446 Groundsmaster 4000 4010 D D Preface

Service and Repairs
General Precautions for Removing and Installing Hydraulic System Components
Before Repair or Replacement of Components
Before removing any parts  from the hydraulic sys-
tem, park  machine on  a level surface,  apply parking
brake, lower cutting decks or attachments and stop en-
gine. Remove key from the ignition switch.
After Repair or Replacement of Components
1.
1.  Checkoillevelinthehydraulic   reservoir andaddcor-
rect oil if  necessary. Drain and refill  hydraulic system
reservoir and change oil filter if component failure was
severe or system is contaminated (see Flush Hydraulic
System in this section).
2.
Clean machine  before disconnecting, removing or
disassembling any  hydraulic components. Make sure
hydraulic components, hoses connections  and fittings
are cleaned thoroughly. Always keep in mind the need
for cleanliness when working on hydraulic equipment.
2.  Lubricate O--rings and seals with clean hydraulic oil
before installing hydraulic components.
3.
Make sure caps or plugs are removed from the hy-
draulic tubes, hydraulic fittings and components before
reconnecting.
WARNING
4.
Use proper tightening methods  when installing hy-
draulic hoses and fittings (see Hydraulic Hose andTube
Installation and Hydraulic Fitting Installation in the Gen-
eral Information section of this chapter).
Before disconnecting  or performing  any work
on the hydraulic system, all pressure in the sys-
tem must be  relieved. See Relieving  Hydraulic
SystemPressureintheGeneralInformationsec-
tion in this chapter.
5.
proper adjustment, binding or broken parts.
After repairs,  check control  linkages or cables  for
6.
After disconnecting or replacing any hydraulic com-
3.
tings and components left open or exposed to prevent
contamination.
Putcapsorplugsonanyhydrauliclines,hydraulicfit-
ponents, operate machine  functions slowly until  air is
out ofsystem (see Charge Hydraulic System in this sec-
tion).
4.
hosesforproperinstallationafterrepairsarecompleted.
Put  labels  on  disconnected  hydraulic  lines   and
7.
rectleaksifnecessary.Checkoillevelinhydraulicreser-
voir and add correct oil if necessary.
Checkforhydraulicoilleaks.Shutoffengineandcor-
5.
Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Markpartsifnecessarytomakesuretheywillbealigned
properly when installing hydraulic hoses and tubes.
Check Hydraulic Lines and Hoses
IMPORTANT: Checkhydraulic linesandhosesdaily
for leaks,  kinked lines, loose  mounting supports,
wear, loose fittings or any hose deterioration. Make
all necessary repairs before operating.
WARNING
Keep body and hands away from pin hole leaks
or nozzles that eject  hydraulic fluid under high
pressure. Use paper or cardboard, not hands, to
search for leaks. Hydraulic fluid escaping under
pressure can have sufficient  force to penetrate
the skin and  cause serious injury. If fluid  is in-
jected  into the  skin,  it must  be  surgically re-
moved within  a few hours  by a doctor familiar
withthistypeofinjury.Gangrenemayresultfrom
such an injury.
Hydraulic System
Page 4 -- 72
Groundsmaster 4000--D/4010--D
Product Specification
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