Procedure for Traction Relief Valve (R3) Pressure
Test:
11.Pressure gauge reading should be at least 3200 PSI
(220.7 bar) higher than charge pressure. Record test
results.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
Example: Consider a machine that has a charge pres-
sure of 240 PSI (16.6 bar). The traction relief pressure
for this machine should be at least 3440 PSI (237.3 bar).
2.
Park machine on a level surface with the attachment
removed. Make sure engine is off and that the parking
brake is applied.
12.Release traction pedal and turn engine off.
NOTE: If the relief pressure cannot be obtained and en-
gine speed drops excessively (below 2800 RPM) as the
traction pedal is depressed, engine performance should
be evaluated (see Chapter 3 – Gasoline Engine).
3.
4.
Read and follow Precautions for Hydraulic Testing.
Make sure that traction pedal is adjusted to the neu-
tral position (see Operator’s Manual).
13.If
traction relief pressure is incorrect, inspect traction
IMPORTANT: Make sure to thoroughly clean around
all hydraulic connections that will be disassembled.
relief valve (R3) in hydrostat (see the Sauer–Danfoss
(Sundstrand) 15 Series Service Manual at the end of this
chapter). Clean or replace relief valve as needed. If re-
lief valve is in good condition, acceleration valves and
charge check valve in hydrostat should be inspected as
well. A worn or damaged hydrostat could be considered
if relief, check and acceleration valves are in good condi-
tion.
5.
forming the Charge Relief Valve (R2) Pressure Test.
Determine the hydrostat charge pressure by per-
6.
hydrostat (Fig. 20). Install pressure gauge to test port.
Remove plug from forward traction port on bottom of
7.
at low idle speed. Check for hydraulic leakage and cor-
rect before proceeding with test.
After installing pressure gauge, start engine and run
14.If
traction relief pressure is correct and a traction cir-
cuit problem exists, check traction pump (P1) flow (see
Traction Pump (P1) Flow Test in this section) and wheel
motor efficiency (see Wheel Motor Efficiency Test in this
section).
8.
Operate engine at full speed (3400 RPM).
15.When
sure gauge from machine and install plug into hydrostat
port.
testing is complete, remove hydraulic pres-
CAUTION
Use extreme caution when taking gauge read-
ings. The front wheel will be turning.
16.Make
Manual).
sure hydraulic tank is full (see Operator’s
9.
Sit in the operator seat, make sure that the parking
brake is applied and slowly push traction pedal in the
forward direction. Depress traction pedal to between
1
1/3
and 1/2 of pedal travel. Engine speed should de-
crease to approximately 2800 RPM as pedal is de-
pressed.
2
IMPORTANT: DO NOT hold system at relief for more
than a few seconds.
3
IMPORTANT: DO NOT allow pressure to exceed
4000
PSI (275.8 bar) during testing.
10.While
gauge and record pressure when the traction circuit re-
lief valve opens.
depressing traction pedal, watch the pressure
Figure 20
1.
2.
Hydrostat (from below)
Forward traction port
3.
Traction rod
Sand Pro & Infield Pro 3040/5040
Page 4 – 25
Hydraulic System
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