Section 8: Lubrication System - Generac Power Systems GTV-990 Manual

SECTION CONTENTS
DESCRIPTION ................................................................ 8-1
PROTECTION SYSTEMS
Low Oil Pressure Switch ............................................ 8-1
High Temperature Switch .......................................... 8-1
CHECKING THE ENGINE OIL LEVEL ................................ 8-1
CHANGING THE ENGINE OIL AND FILTER ...................... 8-2
Recommended Oil Type.............................................. 8-2
Oil Change Procedure ................................................ 8-2
OIL COOLER .................................................................. 8-3
DESCRIPTION
The Generac GTV-990/760 OHVI V-twins use a full pressure
lubrication system with an oil filter. The gerotor type oil pump
draws oil from a screened oil pickup in the sump and pumps
the oil through the oil filter.
The filtered oil flows through an oil galley in the sump and
is distributed to the main bearings, connecting rod bearings
and camshaft bearings. Engine oil pressure will vary with oil
viscosity, ambient air temperature differences, operating tem-
peratures and engine load. Follow the oil recommendation on
page 8-2 of this section.
Oil Pressure - @ 70° F (21 ° C):
15 - 50 psi (1.0 - 3.5 Bar)
A pressure relief valve limits the maximum oil pressure in the
system.
PROTECTION SYSTEMS
LOW OIL PRESSURE SWITCH:
The engine is equipped with a low oil pressure sensor that
closes the circuit between the terminals when the oil pressure
drops below 8 psi. If one terminal is connected to the ignition
kill wire and the other terminal is connected to ground, the
engine will shut down on low oil pressure. If the engine shuts
down by itself and the fuel tank has enough gasoline, check
the engine oil level.
A delay built into the shutdown system on some engine
applications allows oil pressure to build during starting. The delay
allows the engine to run for about 10 seconds before sensing
oil pressure. If the system senses low oil pressure during oper-
ation, the engine shuts down. The engine will not continue to
run until 8 psi of oil pressure is reached. If you try to restart
the engine within (five) 5 seconds after it shuts down, the engine
may NOT start. The system needs 10 seconds to reset.
NOTE: If you restart engine after a shutdown and have
not corrected the low oil pressure, the engine may run
PAGE
for about 10 seconds as described above, and then it will
stop.
HIGH TEMPERATURE SWITCH (OPTIONAL):
This switch's (not shown) contacts close if the temperature
should exceed approximately 140º C (284º F), initiating an
engine shutdown. In certain applications, the equipment will
automatically restart and the LED will reset once the temper-
ature has returned to a safe operating level.
OIL
PRESSURE
SWITCH
Figure 8-1. Engine Protective Devices
CHECKING THE ENGINE OIL LEVEL
The oil capacity of the GTV-990/760 OHVI engine is approx-
imately 2 quarts. To check the engine oil level, proceed as
follows:
1. Remove the dipstick and wipe it dry with a
clean cloth.
2. Install the dipstick completely; then remove it again. The
oil level should be at the dipstick "Full" mark. If necessary,
add oil until the "Full" mark is reached. DO NOT FILL
ABOVE THE "FULL" MARK.
Never operate the engine with the oil level below
!
the "Add" mark on the dipstick. Doing this could
damage the engine.
8-1

SECTION 8: LUBRICATION SYSTEM

OIL FILTER