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JOHN DEERE - 388 Back
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Adjust windrow width
Rotary disc cutterbar
Simple to operate platform controls

You might call it a windrower on steroids. Or call it the best way to utilize a high horsepower tractor during silage season. Its the John Deere Triple Mounted Mower-Conditioner. You start with a tractor with at least 190 horsepower and a front hitch with PTO. Put a 131 Front Mounted MoCo upfront. Then add a 338 Twin Rear-Mounted MoCo on the back. Suddenly your tractor is cutting up to 28 feet 8 inches (8.74 m) with each pass. Rotary disc cutterbars mean youll cut fast and clean. And impeller conditioning means fast crop flow, and fast dry down. Build three windrows, or follow with a rake or merger to maximize forage harvester performance.

The 388 Twin Rear-Mounted Mower Conditioner is matched with a 131 Front-Mounted Mower-Conditioner to make what is commonly called a Triple-Mounted Mower-Conditioner (TMMC). This combination cuts nearly 8.73 m (28 ft, 8 in.) but can easily be converted to a narrow transport width of 3.1 m (10 ft, 2 in.).

To prepare for transporting, the side curtains of the 131 Front-Mounted Mower-Conditioner are unlocked and folded into the transport position. This will reduce the overall width during transport. The transport lock lever on the 131 Front-Mounted Mower-Conditioner is engaged so that side-to-side oscillation during transport is eliminated.

The side curtains are unlocked and pinned to reduce the overall transport height of the TMMC. The side curtain support provides rigidity to the side curtains during cutting and is folded down in transport to reduce the overall height.

Using the control panel configured to headland turn (switch in yellow circle moved to RH, Zone 2 switch centered), the operator uses the tractor hydraulics to raise the platforms. The mower-conditioner frame should be centered in preparation for transport.
Move switch to activate Zone 1
Hold switch up to fold mower-conditioner while activating the tractor selective control valve (SCV)
When completely folded, spring controlled locks secure the mower-conditioner in the transport position

Rear three-point hitch may be adjusted, as necessary, to assure the overall height of the mower-conditioner does not exceed 4.0 m (13 ft, 1 in.). A spring-loaded safety lock secures the mower-conditioner in the raised position.

To prepare for field operation, the rope connected to the safety lock on the 388 Twin Rear-Mounted Mower-Conditioner is held while the platforms are partially lowered (rope can be released as soon as mower-conditioner is unlatched), using the control panel and tractor SCV. The balance of the procedure above is reversed to continue on to field operation.

Flotation is controlled by accumulators on both the right-hand and left-hand cutting platforms. The easy to read gauges (one for each cutting platform) enable the operator to easily adjust the float pressure to the desired level.

A ball valve by the pressure gauge is opened and by using the control panel mounted in the tractor and the tractor selective control valve (SCV), the pressure can be adjusted to meet varying ground or crop conditions.

The control panel is used to adjust flotation of both the rear cutting platforms as well as the 131 Front-Mounted Mower-Conditioner.
The third switch from the left is moved to the left to activate the features on the left side of the control panel
Platforms are placed in cutting position
Ball valve by pressure gauge is opened
Open both valves on 388 Twin Rear-Mounted Mower-Conditioner to adjust float pressure to the same setting
Right-hand and left-hand platforms can be adjusted separately if required
Open valve by gauge on 131 Front-Mounted Mower-Conditioner to adjust float pressure on front unit
Hold switch (yellow circle) up to adjust 131 Front-Mounted Mower-Conditioner or hold down to adjust 388 Twin Rear-Mounted Mower-Conditioner
Activate tractor selective control valve (SCV) to reach desired setting
Release switch
Close appropriate ball valve

The mower-conditioner is equipped with 54 free-swinging, steel impeller tines. This John Deere conditioner provides excellent conditioning performance and fluffy windrows. Impeller conditioning is standard equipment on all John Deere mower-conditioners.

Proper conditioning in a wide range of crops can be achieved when the conditioner is properly adjusted. The impeller conditioner works well in legumes, especially alfalfa and most all-grass crops. Impeller conditioners are not recommended for thick-stemmed or cane-type crops, such as sudan or sudex, or crops over 5-ft tall.

Forming shields are easily adjusted to control material flow. This allows the operator to match the windrow width to harvesting requirements.

The forming shields are easily adjusted to match harvest requirements. No tools are required to adjust the forming shields. Windrow width on each unit can be adjusted from 1.2 to 2.5 m (3 ft, 11 in. to 8 ft, 2 in.).

A widespread kit is available as a field-installed bundle. The bundle consists of vanes that are installed behind the conditioning hood. The windrow width when using the widespread kit can be adjusted to be approximately the same as the cutting width of the platform.

Power is transmitted from the 1000-rpm tractor (1-3/4-in.) PTO through a central gearcase to the twin rear-mounted cutterbars.
Each cutterbar is protected by a slip clutch and overrunning clutch
The cutterbar is securely mounted within the frame for strength and durability
Power is transmitted to the rotary disks through fully enclosed gears, running in oil, for quiet, smooth, reliable operation
The high-speed rotary disks cut in the toughest conditions. The disks rotate at 2986 rpm
Low-profile design enables cutting close to the ground at a flat angle helping prevent damage to the disks and knives
Cutting height is adjusted by changing cutting angle
Pinion gear is easily removed from the top of the cutterbar for service
Idler gears can be removed from access area after removal of pinion gear

The simple to operate control panel enables the operator to easily operate all of the hydraulic functions of the 388 Twin Rear-Mounted Mower-Conditioner.

Features/functions of the control panel include:
On/off push-button switch with indicator light
Reverse polarity indicator light
Folding 388 Twin Rear-Mounted Mower-Conditioner into transport position
Adjusting floatation of 131 Front-Mounted Mower-Conditioner
Adjusting floatation of 388 Twin Rear-Mounted Mower-Conditioner
Zone selection switch
Headland turn selection switch

With the zone selector switch moved to activate Zone 1 the operator can fold the 388 Twin Rear-Mounted Mower-Conditioner into transport position or adjust the cutterbar flotation on either the front or rear cutterbars.
The 388 Twin Rear-Mounted Mower-Conditioner can only be raised into the transport position after turning off the rear PTO and waiting for all components to stop moving. The rear mower-conditioners must also be moved into the headland position prior to folding for transport.
The left-hand switch in zone 1 is used to fold and unfold the mower-conditioner.
The switch must be held while activating the proper tractor selective control valve (SCV) to fold or unfold the mower-conditioner.
It is a momentary switch and will return to its neutral position when released.
A mechanical lock secures the platforms in the transport position.
The right-hand switch in zone 1 is used to adjust cutterbar flotation on the front and rear mower-conditioners.
A hydraulic line is routed from the 131 Front-Mounted Mower-Conditioner to connect to the 388 Twin Rear-Mounted Mower-Conditioner.
The switch is held upward to adjust the flotation of the 131 Front-Mounted Mower-Conditioner.
The switch is held downward to adjust the flotation of the 388 Twin Rear-Mounted Mower-Conditioner.
Ball valve on respective units must be opened to adjust pressure and closed when complete

Zone 2 is the primary setting for field operation. The three-position switch in Zone 2 is used to select the headland turn or working position of the rear cutting units. The position of the switch will determine which cutting platform or both will be raised
Center position using the tractor SCV, both cutting platforms will be raised or lowered when making a headland turn
Left position the left-hand cutting platform will remain raised when reentering the crop (used to avoid recutting windrows)
Right position - the right-hand cutting platform will remain raised when reentering the crop (used to avoid recutting windrows)

Similar models may be shown in addition to the featured model. Equipment may be shown with options. Specifications are subject to change without prior notice.
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