Calendar_revised2011.pdf
AFFECTED MODELS: SR, SRA AND AR SERIES HARVESTERS
On some models, the chop mechanism may not return to the up position after chopping. This may occur only intermittently and operate normally most of the time or the chop may stay in the down position..
The cooling fan motor case drain (Figure 1) on models prior to serial No. 208 (SR), 109 (SRA) and 108 (AR) is connected to a return-to-tank circuit that is attached to the manual chop valve. See Figure 2. Because the fan motor case drain is connected to the chop valve return circuit, it can create enough pressure to cause the chop system to remain in the down position. Routing the fan motor case drain directly to tank eliminates this problem.
Figure 1--Cooling Fan Motor Case Drain
To determine if the fan motor case drain is causing the chop mechanism to not return to the up position, disconnect the case drain from the fan motor (Figure 1). Plug the hose using a No. 6 JIC plug and cap the motor fitting using a No. 6 JIC cap. Operate the harvester and chop system. If the chop system now operates normally, the fan motor case drain is causing excessive pressure in the return-to-tank circuit.
1. Disconnect the
fan motor case drain hose from the T-fitting at the manual chop valve. Using a
No. 6 JIC cap, cap the Tee-fitting as shown in Figure 2.
Figure 2--Disconnect Fan Motor Case Drain Hose and Cap the Fitting
2. Disconnect the case drain hose from the cooling fan motor Figure 1).
3. Disconnect the two return hoses and remove the swivel nut run Tee fitting at the hydraulic reservoir. Install a No. 6 swivel union and a No. 6 union cross as shown in Figure 3.
Figure 3--Install a Swivel Union and Union Cross to the Reservoir as Shown.
4. Attach an appropriate length hose with No. 6 female JIC fittings to the cooling fan motor. Route the hose under the harvester as necessary to avoid moving or sharp components. Clamp or tie the hose as required.
5. Attach the hose to the hydraulic reservoir union cross fitting as shown in Figure 3. Operate the harvester to check for proper chop system operation. Check for leaks and tighten the fittings as necessary.
Contact Bucyrus Equipment Company Inc. (800-330-0857) for the necessary parts to perform this update.
- Part No. 1300100-Hose Assy--case drain hose
Subject: Improved Hydraulic Cylinder Mounting Bushings and Pins for Second Conveyor and Net Feed Valve Adjustment
MODELS AFFECTED: SR, SRA AND AR SERIES HARVESTERS
On some models, excessive wear can occur at the rear conveyor hydraulic cylinder lower mounting perch (Figure 1).
Figure 1--Cylinder Lower Mount
Excessive wear in this area will allow the conveyor to travel too far downward and possibly result in net feed valve failure.
To check for excessive wear, raise and lower the rear conveyor while observing for play where the cylinders mount to the frame. Also, fully lower the conveyor and check the spring deflection as the leaf spring activates the net feed valve. (Figure 2).
Figure 2--Net Feed Valve (1) and Leaf Spring (2)
The leaf spring should deflect approximately ½ in. (12.7 mm) when the conveyor is fully down. If spring deflection exceeds ½ in. (12.7 mm), the cylinder mounts may be excessively worn. Be aware, however, that excessive deflection can also be caused by a misadjusted net feed valve.
NOTE:
The leaf spring that activates the net feed valve must not contact the conveyor frame during operation or valve damage will occur. Correct adjustment is essential for proper net feed operation.
New spring steel bushings and mounting pins are available to correct this situation. The pins are cross-drilled and tapped to accept a grease zerk.
The bushings consist of four ¾ in. (19.05 mm) bushings and two 1 in. (25.4 mm) bushings. Contact Bucyrus Equipment Company Inc (800-330-0857) to obtain the parts necessary to perform this update.
- ¾ in. bushing--part No. 100075075 (four required)
- 1 in. bushing--part No. 100075100 (two required)
- Pin--SC219-2 (two required)
WARNING
Only disconnect one cylinder at a time and engage the cylinder stop (Figure 3) on the opposite side to prevent the conveyor from falling.
Figure 3--View Showing Cylinder Safety Stop Engaged
1. Raise the rear conveyor as necessary to disconnect the lower mount.
2. Remove the pin and lower the cylinder stop on the opposite side that you are working on. See Figure 3. Secure the stop in place using the pin.
3. Remove the lower mounting pin and bushings from the cylinder and frame perch.
4. Install the short bushings into each mounting lug on the cylinder. Install the long bushing into the frame mounting perch. Note that the bushings are a slight interference fit.
5. Attach the cylinder to the frame and install the mounting pin with the grease zerk facing outward.
6. Repeat this procedure for the remaining cylinder.
7. Next, check net feed valve adjustment as follows:
a. Slowly lower the rear conveyor while observing leaf spring deflection as the spring activates the net feed valve.
b. Spring deflection should be approximately ½ in. (12.7 mm) with the rear conveyor in the fully down position.
c. If adjustment is necessary, loosen the jam nut and turn the adjustment bolt (2, Figure 2) in or out as necessary to obtain the correct spring deflection. Securely tighten the jam nut and recheck the adjustment.
d. With the conveyor fully lowered, turn on the rear conveyor and make sure the net feed rollers activate normally.