Hydraulic Filters; Electrical System - Jacobsen 67971 – LF 3400 Parts & Maintenance Manual

4 MAINTENANCE

4.13 HYDRAULIC FILTERS ______________________________________________________

The hydraulic system is protected by two 10 micron filters, a
charge filter (B) and return line filter (A). Flow though the
filters is monitored during operation. When pressure drop
across the filters is too high the hydraulic oil filter warning
light will come on. To ensure continued protection to the
hydraulic system, replace both filters as soon as possible
after light comes on.
NOTICE
During cold weather the warning light may come on until
oil has warmed up to operating temperature. Wait until oil
has warmed up and light goes out before operating
mower.
To replace hydraulic filters:
1. Remove the old filters.
2. Install new filters. Hand tighten only.

4.14 ELECTRICAL SYSTEM _____________________________________________________

!
CAUTION
Always turn the ignition switch off, and remove the
negative battery cable (Black), before inspecting or
working on the electrical system.
General precautions that can be taken to reduce electrical
problems are listed below.
1. Make certain all terminals and connections are clean
and properly secured.
2. Check the interlock system, fuses, and circuit breakers
regularly.
If the interlock does not function properly and the
problem cannot be corrected, contact an authorized
Jacobsen Dealer.
3. Keep the wire harness and all individual wires away
from moving parts to prevent damage.
4. Make sure the seat switch harness is connected to the
main wire harness.
5. Check the battery and battery charging circuit.
6. Do not wash or pressure spray around electrical
connections and components.
The electrical system is monitored and controlled by the
electronic controller (C) located behind the operator's area.
The controller is equipped with two banks of LED's which
can be used when troubleshooting the electrical system, see
Section 5.2.
22
3. Operate engine at idle speed with hydraulic system in
neutral for five minutes. The oil level alarm may sound
during this time.
4. Check hydraulic oil level in reservoir and fill to full mark
on dipstick.
B
A
CIrcuits are protected by a circuit breaker, fuses, and relays
mounted next to the controller.
F1
F2
FUSES
F1 20 A ALTERNATOR, GAUGES, SWITCHES
F2 20 A LIGHTS
RELAYS
K10 GLOW PLUG
K11 STARTER
LF018
Figure 4B
K10 K11
C C
50A
CIRCUIT BREAKER
LF019
Figure 4C