Procedure for Charge Pressure and Implement Re-
lief Valve (R1) Pressure Tests:
A. For Sand Pro 3040 and Infield Pro 3040 ma-
chines, measured implement relief pressure should
be from 900 to 1100 PSI (62.1 to 75.9 bar).
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
B. For Sand Pro 5040 and Infield Pro 5040 ma-
chines, measured implement relief pressure should
be from 780 to 980 PSI (53.8 to 67.6 bar).
2.
Park machine on a level surface with the attachment
lowered. Make sure engine is off and that the parking
brake is applied.
10.Shut off engine and record test results.
11.
If charge pressure specification is not met, inspect,
3.
Read and follow Precautions for Hydraulic Testing.
repair or replace charge relief valve (R2). If implement
relief specification is not met, inspect, repair or replace
implement relief valve (R1). See Sauer–Danfoss
(Sundstrand) 15 Series Service Manual at the end of this
chapter for relief valve service information.
IMPORTANT: Make sure to thoroughly clean around
all hydraulic connections that will be disassembled.
4.
Install pressure gauge to machine:
12.Remove
pressure gauge. On Sand Pro 3040 and In-
A. For Sand Pro 3040 and Infield Pro 3040 ma-
chines, remove plug from one of the hydrostat
charge test ports (Fig. 17). Install pressure gauge to
test port.
field Pro 3040 machines, install and tighten hydrostat
test port plug. On Sand Pro 5040 and Infield Pro 5040
machines, reconnect hydraulic hose to hydrostat tee fit-
ting.
B. For Sand Pro 5040 and Infield Pro 5040 ma-
chines, install a tee connector with pressure gauge in
series between the tee fitting on the lower right side
of the hydrostat and the hydraulic hose from the hy-
drostat (Fig. 18).
13.Make
Manual).
sure hydraulic tank is full (see Operator’s
SP/IP 3040
5.
Make sure that traction pedal and lift control lever are
in neutral and the parking brake is applied.
2
2
6.
Start engine and run at low idle speed. Check for hy-
draulic leakage and correct before proceeding with test.
1
7.
Operate engine at full speed (3400 RPM). Verify
pump hub speed with a phototac.
Figure 17
8.
sure and should read as follows. Record test results.
The pressure gauge will display system charge pres-
1.
Hydrostat (from below)
2. Charge test port
A. For Sand Pro 3040 and Infield Pro 3040 ma-
chines, charge pressure should be from 120 to 330
PSI (8.3 to 22.7 bar).
1
SP/IP 5040
B. For Sand Pro 5040 and Infield Pro 5040 ma-
chines, charge pressure should be from 70 to 330
PSI (4.8 to 22.7 bar).
4
NOTE: If machine is equipped with optional front lift,
charge pressure will increase approximately 50 PSI
(3.5
bar).
3
IMPORTANT: DO NOT hold system at implement re-
lief for more than a few seconds.
2
Figure 18
9.
With the engine still running at full speed (3400
1.
2.
Hydrostat (from below)
Hydrostat tee fitting
3.
4.
Hydraulic hose
Traction rod
RPM), move lift lever to the lower position. Hold lift lever
in the lower position to allow the implement relief valve
to activate. The pressure gauge will display implement
relief pressure and should read as follows. After noting
pressure, return lift lever to neutral position.
Sand Pro & Infield Pro 3040/5040
Page 4 – 23 Rev. A
Hydraulic System
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