Hydraulic System Start--up
NOTE: When initially starting the hydraulic system with
new or rebuilt components such as the hydraulic pump,
wheelmotorsorliftcylinder,itisimportantthatthisstart--
up procedure be used. This procedure reduces the
chance of damaging the hydraulic system or its compo-
nents from not purging the system of air.
C. Attach a heavy chain between the rear of the ma-
chineframeandsomethingimmovableintheshopto
prevent the machine from moving during the bleed-
ing process.
IMPORTANT: Make sure oil flow indicator arrow
on the flow gauge is showing that oil will flow
from the test port of traction line and through the
tester.
1.
After the hydraulic system components have been
properly installed and if the hydraulic pump was rebuilt
or replaced, make sure traction pump housing is atleast
half full of clean hydraulic oil (see Operator’s Manual for
oil specifications).
D. Connectinletendofhydraulictesterwithflowme-
ter and pressure gauges to test port in upper traction
line(Fig.27).Placeoutletendoftesterinadraincon-
tainer. Make sure that flow control valve on the tester
is fully closed.
2.
Makesureallhydraulicconnectionsandlinesarese-
cured tightly.
3.
Make sure hydraulic reservoir is full. Add correct oil
E. Check hydraulic reservoir level and fill if neces-
sary.
if necessary (see Operator’s Manual). Drain, flush and
refill hydraulic system reservoir and change oil filter if
component failure was severe or if system is contami-
nated.
F. Start engine and move traction lever to the for-
ward direction to allow the wheels to rotate slowly.
NOTE: Bleeding the traction circuit might require
approximately five (5) minutes of running.
4.
ment,bindingorbrokenparts.Correctanyproblems be-
fore proceeding.
After repairs, check control linkage for proper adjust-
IMPORTANT: When bleeding the traction circuit,
tester valve should be barely open which will al-
low a slow stream of oil from tester outlet.
5.
to prevent engine from starting.
Disconnect andgroundbothenginesparkplugwires
G. Whiletractionleverisheldintheforwarddirection
(wheels turning), have second person slowly open
valve on tester very slightly to allow air out of traction
circuit. Air in the traction circuit will be indicated by
foamy oil coming from the outlet end of the tester.
6.
key switch to start; engage starter for ten (10) seconds
to prime hydraulic pump. Repeat this step again.
Make sure traction lever is in neutral. Turn ignition
7.
8.
in neutral. Start engine and run at low idle. The charge
pump should pick up oil and fill the hydraulic system.
Reattach both spark plug wires.
Apply parking brake and make sure traction lever is
H. While bleeding the traction circuit, if more than .5
gallon (1.9 liters) of oil is removed, close tester valve
and release traction lever. Check hydraulic oil reser-
voir level and fill ifnecessary.Continue with bleeding
procedure.
9.
wheel motor was replaced), bleed the traction circuit to
evacuate air from the circuit:
If traction circuit was repaired (e.g. hydrostat or
I. Whenallevidenceoffoamyoilhasbeenevacuat-
ed from the traction circuit, close tester valve, re-
lease traction lever and stop engine.
NOTE: Before bleeding the traction circuit, review the
following procedure (steps A through L) completely.
J. Remove tester from traction circuit test port.
Check hydraulic reservoir level and fill if necessary.
A. Stop engine and relieve pressure in traction cir-
cuit by moving traction lever to both forward and re-
verse direction.
K. If the hydrostat or a wheel motor was replaced or
rebuilt, start engine and operate the traction system
so the wheels rotate slowly for 10 minutes.
B. Jack up machine from floor and support machine
with jack stands or blocking to allow wheels to turn
freely.
L. Lower machine to ground. Remove chain from
rear of machine.
Hydraulic System
Page 4 -- 32 Rev. A
ProCore 648
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