CAB AR 5415007 - Caterpillar

ACTION REQUIRED
A Hydraulic system change incorporating a relief valve is needed to provide Impeller priority. Install a relief valve circuit between the auger and impeller motor to allow hydrailic oil to continue through the impeller motor during conditions in which the auger motor is stalled or slowed.
SERVICE CLAIM ALLOWANCES
Product smu/age whichever comes first Caterpillar Dealer Suggested Customer Suggested
Parts % Labor Hrs% Parts % Labor Hrs% Parts % Labor Hrs%
0-48 mo 100.0% 100.0% 0.0% 0.0% 0.0% 0.0%
This is a 1.5-hour job
PARTS DISPOSITION
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Rework Procedure
Refer to your service manual for all safety information before completing the rework procedure.
1. Ensure that all O-ring seals are assembled on the
respective fittings.
2. Assemble the relief valve (2) onto the ?STOR to
ORFS? swivel adapter (1). Adjust the mounting
angle to about 45?. Refer to illustration 1.
Image1.1.1
Illustration 1
(C) Return line to machine
(D) Control Manifold and cover
(1) 7X-3164 Swivel Adapter
(2) 290-2502 Relief Valve
(3) 290-6547 Hose As
(6) 3K-0360 O-Ring Seal
(7) 6V-8398 O-Ring Seal
(8) 6V-8555 Face Seal Nut
(9) 6V-8939 Reducer
(10) 6V-9746 O-Ring Seal
(11) 6V-9838 Swivel Tee
(13) 6V-9877 Elbow
(14) 7J-9108 O-Ring Seal
3. Disconnect hose (C) from the control manifold.
Remove the adapter fitting that coupled the hose
to the control manifold. Discard the adapter.
Loosen the mounting bolts for the control manifold.
Install tee adapter (11) to the control manifold.
Orient the tee so that the branch of the tee faces
upward. Tighten the tee.
4. Install the relief valve assembly onto the tee (11).
5. Tighten the mounting bolts of the control manifold.
6. Reinstall the hose (C) onto the horizontal port of
the tee (11).
7. Remove the guard for the impeller?s motor.
Unhook the inboard supply tube. Unhook the
outboard supply tube (B) that goes to the auger
motor. Remove both adapters from the motor. Refer to illustration 2.
Image1.2.1
Illustration 2
(A) Motor (Impeller)
(B) Supply line from Impeller to Auger Motor
(3) 290-6547 Hose As
(4) 6V-9032 Tee
(5) 2M-9780 O-Ring Seal
(10) 6V-9746 O-Ring Seal
(12) 6V-9853 Elbow
(14) 7J-9108 O-Ring Seal
8. Install the remaining tee (4) onto the outboard
supply tube (B). Orient the tee outward. Tighten
the tee. Reinstall one of the adapter fittings into
the inboard port of the impeller?s motor.
9. Install the tubes onto the respective fittings.
Tighten the tubes.
10. Add the swivel elbow (12) to the branch of the tee.
11. Run hose (3) from the ?ORFS? port (12) to the
elbow (13) of the relief valve.
12. Adjust all fittings in order to remove binding.
Tighten the fittings.
13. Test the snowblower. Adjust the relief valve in
order to achieve optimum performance. The
normal relief setting is 14480 kPa (2100 psi).
Reducing the setting by turning the relief valve
counterclockwise will increase the torque of the
impeller. This will cause an increase in snow
discharge power. The torque of the auger will
be reduced. Conversely, if the relief setting is
increased by turning the relief valve clockwise, the
torque of the auger will increase. The torque for
the impeller will decrease.
Image1.3.1