Jacobsen HR 5111, Service And Repair Instructions

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GENERAL
The tests in this section are provided as a means of
isolating a problem in the hydraulic system.
This section consists of two test methods. The first;
Relief Valve Tests, using pressure gauges only. Using
this method results in some test conclusions not being
final. Second; Starting with the Traction System Test,
an in-line hydraulic flow/pressure instrument is used
(see Figure 8R-1). This method is more complete and
will result in a final conclusion of the failure.
Make sure the tractor is secured and cannot roll. If in-
terlock systems are bypassed, exercise caution when
performing each test — do so in a safe manner.
It is important to follow the instructions accurately and
completely. Make sure to plug lines and cap ports when
so instructed. Also, read and follow the Preliminary
Checks provided in Section 8Q before proceeding with
the instrument tests.
IMPORTANT
All of the tests in this section use an in-line tester
as shown in Figure 8R-1. When using tester with
variable gpm settings, make sure tester is set for
the proper flow range to avoid damage to the
test instrument. It is recommended that you re-
cord all readings obtained during these tests. It
is important that you accurately run all tests at
the same engine rpm and oil at operating tem-
perature.
HYDRAULICS
SECTION 8R. INSTRUMENT TEST
8R-1
8R
!
CAUTION
Make sure interlock system is reconnected after
test has been completed.
Figure 8R-1. In-Line Tester