White Outdoor LT-5 - 700 Service Manual
Service Manual
LT-5 - 700 Series Rider
NOTE: These materials are for use by trained technicians who are experienced in the service and repair of outdoor power
equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals.
These materials are intended to provide supplemental information to assist the trained technician. Untrained or inexperienced individuals should seek the assistance of an experienced and trained professional. Read, understand, and follow all
instructions and use common sense when working on power equipment. This includes the contents of the product’s Operators Manual, supplied with the equipment. No liability can be accepted for any inaccuracies or omission in this publication,
although care has been taken to make it as complete and accurate as possible at the time of publication. However, due to
the variety of outdoor power equipment and continuing product changes that occur over time, updates will be made to these
instructions from time to time. Therefore, it may be necessary to obtain the latest materials before servicing or repairing a
product. The company reserves the right to make changes at any time to this publication without prior notice and without
incurring an obligation to make such changes to previously published versions. Instructions, photographs and illustrations
used in this publication are for reference use only and may not depict actual model and component parts.
© Copyright 2005 MTD Products Inc. All Rights Reserved
MTD Products Inc - Product Training and Education Department
FORM NUMBER - 769-01415
10/2005
TABLE OF CONTENTS
Introduction ............................................................................................................................1
Deck Removal .......................................................................................................................2
Deck Details and Updates for 2005 .......................................................................................3
PTO Cable .............................................................................................................................5
Deck Lift ................................................................................................................................6
Hydrostatic Transaxle ............................................................................................................9
Transaxle Control Linkage ..................................................................................................12
Drive Belt: Hydrostatic Drive ...............................................................................................14
Clutch/Brake Linkage : Hydrostatic .....................................................................................16
Parking Brake : Hydrostatic Drive .......................................................................................17
Belt Replacement: Variable Speed Belt Drive .....................................................................18
Speed Control Linkage Adjustment: Variable Speed Belt Drive ..........................................20
Cruise Control/Parking Brake Adjustment: Variable Speed Belt Drive ................................21
Steering ......................................................................................................................
.........22
Steering Gear ......................................................................................................................25
Pivot Bar ..............................................................................................................................28
Electrical System .................................................................................................................30
Fastener Installation Specs .................................................................................................47
700 SERIES LAWN TRACTORS
700 SERIES LAWN TRACTORS
1. INTRODUCTION
1.1. Disclaimer: This service manual was intended
for the use, by trained technicians. The information contained in this manual is current and
accurate at the time of writing, but is subject to
change without notice.
1.2. Description: A new step-through rider platform
was introduced for the ‘05 mowing season. It is
designated as the 700 series rider. This series
replaces the 660 through 690 series box frame
riders. The mower depicted in most of this
manual is branded “White”, and designated by
factory #13A2791
the portion of this manual that covers the variable speed drive system is branded “Troy-Bilt”,
and designated by factory # 13AN779
representative of the series. See Figure 1.2.
G790. The mower depicted in
G766. It is
1.5. Variations: Other The 700 series platform will
accommodate a variety of single and twin cylinder engines, and a range of styles and brands
will be applied to it. The steel dash panel is
common to all 700 series, and plastic inserts will
be used to match the different hoods used.
1.6. Spotter’s Guide: The 700 series is visibly similar to the existing step-through platform 600 and
610 series lawn tractors, but there are substantial differences.
• Drive System: Hydro The 790 series declutches the traction drive belt when the clutch/
brake pedal is depressed, without moving the
fender-mounted transmission control lever. In
contrast, the 610 series hydro is controlled by a
foot-operated rocker pedal. The operator of the
610 series must remove their foot from the
rocker pedal to apply the brake. The rocker
pedal is spring-loaded to return to neutral.
• Drive System: Non-hydro The 770 and 600
series transmission are both operated by a gear
selector lever on the right fender. Ground
speed is controlled by a clutch/brake pedal on
the left side of the 770. Ground speed is controlled by an automotive style drive pedal and a
separate brake pedal on the right side of the
tractor on the 610 series. The variable speed
pulley principal is the same, but pedal operation
is reversed.
Figure 1.2
1.3. Variations: Drive Systems The 700 series is
available with a HydroGear hydrostatic transmission or a variable-speed pulley system driving a
simple Forward-Neutral-Reverse transmission
manufactured by MTD. The Hydrostatic versions
will have model numbers in the 790 range. Nonhydro versions have model numbers in the 770
range.
1.4. Variations: Cutting Decks Two decks will be
available on the 700 series platform: 38” (97cm)
designated by an F in the eighth position of the
model number, and 42” (107cm), designated by
a G in the eighth position of the model number.
• Deck Engagement: The PTO belt is engaged
on the 700 series using a lever on the right
fender. The 600 series uses a dash-mounted
lever or an electric PTO clutch.
• Decks: While the 700 series accepts only an F
or G deck, the 600 series will accept a variety of
decks that include 46” (H deck), 50” (P deck).
Both series have Fast-Attach
600 series has “J” pins to connect the rear of the
deck, while the 700 series decks are secured
directly to the lift rods and lift links by locking
internal cotter pins (“hairpin clips” that resemble
a bow-tie in configuration).
1
TM decks, but the
700 SERIES LAWN TRACTORS
2. DECK REMOVAL
2.1. The engine should be turned off long enough for
the exhaust system to cool before starting work.
2.2. The controls should be in the following positions:
PTO lever: OFF Deck height: lowest position
2.3. Remove the crankshaft pulley belt keeper using
a 1/2” wrench. See Figure 2.3.
Belt keeper
Contact point
Figure 2.3
2.5. With the deck on the ground, the lift rods can be
reconnected to the lift links. This will enable the
rods and links to be moved out of the way by lifting the deck height lever. See Figure 2.5.
Lift rod reconnected
Figure 2.5
2.6. Working from the right side of the tractor,
remove the hairpin clip that secures the PTO
cable housing to the bracket on the deck. Separate the cable from the bracket. See Figure 2.6.
NOTE: The belt keeper doubles as the deck upstop.
NOTE: The correct place for the pin-end of the
belt keeper is the small hole in the right frame
channel, roughly in-line with the crankshaft.
2.4. Remove the hairpin clips that secure the deck lift
rods to the cutting deck and the deck lift links.
See Figure 2.4.
New locking hairpin clips
secure lift rods to lift links
and cutting deck
Figure 2.4
Hairpin clip
Bracket
PTO Cable
Figure 2.6
NOTE: There is a small plastic spacer that fits
between the hairpin clip and the bracket
2.7. Unhook the PTO cable spring from the idler pulley bracket, and move the cable out of the way.
NOTE: Some early production units were
equipped with a brake rod that passed above the
PTO cable spring. On these models it is necessary to disconnect the brake rod before removing the spring.
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700 SERIES LAWN TRACTORS
2.8. Slide the deck forward slightly, and slip the PTO
belt off of the crankshaft pulley.
2.9. Because of angular interference between the
inside angle of the front deck support rod and
the hooks on the front of the deck, the following
manipulations will ease deck removal:
See Figure 2.9.
Cold-headed end
Left side slot
Figure 2.9
• Align the rod with the slot in the left side of the
bracket on the deck.
• Pivot the rod up on the left side to clear the slot.
• Move the deck forward slightly so that the right
side (cold-headed end) of the rod may be lifted
out of the right side bracket on the deck.
2.10. Reverse the removal process to install the deck.
Test the operation of the mower and it’s safety
features before returning it to service.
3. DECK DETAILS AND UPDATES FOR 2005
3.1. The front deck support rod is easily removed by
slipping it forward until the coined spot slips
through the opening in the bracket that supports
it. See Figure 3.1.
Front deck
support rod
Figure 3.1
• The nut and jam nut are used to make and
secure fore / aft deck level adjustment using a
pair of 3/4” wrenches.
• The deck should be set slightly nose-down:1/4”
(1.27cm) to 3/8” (1.9cm) to maintain vacuum
beneath the deck, improving cutting performance.
• Measurement is made from blade-tip to ground,
with the blades oriented front-to-back.
• Slots are provided in the muffler cover for easy
removal of the rod.
Pivot cup
NOTE: Using a length of 2X4 dimensional lumber, or similar object to support the front edge of
the deck will make it easier to connect the deck
lift rods and deck lift links.
• The hemispherical pivot cup nestles in a recess
in the front of the bracket.
• Side-to-side leveling is accomplished using a
pinion gear and clamp screw on the left-rear
deck hanger bracket. The deck should be set
level from side-to-side, as measured from the
blade tip to the ground with the blades oriented
end-to-end. Adjustment is made using a 1/2”
wrench and a 1 1/4” wrench.
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700 SERIES LAWN TRACTORS
3.2. The hooked side of the front deck support rod
belongs on the left. This is important because
there is a slight bend in the rod. The rod needs
to angle down to clear the steering tie-rod before
extending back to meet the deck.
See Figure 3.2.
Note bend in rod compared to straight-edge
Coined flat spot
Figure 3.2
3.3. The re-configured brake rod now uses a short bit
of 5/16” fuel line as a damper. See Figure 3.3.
3.5. The 42” deck has a fixed idler pulley to provide
better wrap on the left spindle pulley, and a tensioner pulley to tighten the belt. See Figure 3.5.
Figure 3.5
3.6. The 38” deck has a shorter belt, and a single
tensioner pulley to tighten the belt.
See Figure 3.6.
Angled
brake pad
Damper
Figure 3.3
3.4. The blade brake pads are attached at a slight
angle to prevent chatter on PTO disengagement.
Figure 3.6
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700 SERIES LAWN TRACTORS
4. PTO CABLE
4.1. The deck engagement lever is supported by a
two-piece bushing under the right fender.
See Figure 4.1.
Deck
engagement
lever
Figure 4.1
4.2. The return spring can be removed from the
inside of the lever using a hooked tool, with the
PTO lever in the OFF position.
4.3. The PTO cable can be removed from its bracket
by squeezing the barbs to release it. Once
released, there will be enough slack in the cable
to unhook the Z-fitting from the PTO lever.
See Figure 4.3.
4.4. The bushing is easily replaced by simply unbolting the two halves using a 3/8” wrench.
See Figure 4.4.
Figure 4.4
NOTE: The washer and hairpin clip have been
removed here for the sake of visibility.
NOTE: The lever itself is difficult to replace without removing the fender.
4.5. The cable is properly routed behind the transmission to reach the left side frame channel,
where it is secured by a clip. See Figure 4.5.
Hook tool
Figure 4.3
Z-Fitting
Barbed end
Note cable routing
Figure 4.5
4.6. From there, the cable reaches forward, secured
beneath the foot-pad on the fender by a hairpin
clip and bracket similar to the deck-end mounting.
5
700 SERIES LAWN TRACTORS
5. DECK LIFT
5.1. In an advancement over the box-frame design,
the deck height and engagement functions are
isolated from one-another.
5.2. The deck lift control, located on the right fender,
rotates a cross-shaft and two slotted bell-cranks
(lift shaft assembly) that draw up and back on
the deck lift rods. See Figure 5.2.
Deck lift lever
Lift-shaft
bushing
Figure 5.2
NOTE: The slotted configuration of the bell-
crank arms suspends the deck, yet allows it to
float upward as the anti-scalp wheels encounter
bumps.
5.3. The the deck lift links are distinct from left to
right: there are two different part numbers.
See Figure 5.3.
Left-side has flat at front
Bellcrank (right side)
Lift rod
5.4. The bushings that support the lift shaft assembly
are easily replaced. See Figure 5.4.
Hex bushing
E-clip
retaining ring
Figure 5.4
• Remove the cutting deck, or support it using
2”X4” dimensional lumber or similar, to relieve
the weight from the linkages.
• Lift and safely support the back of the tractor.
• Remove the rear wheels using a 1/2” wrench
(not absolutely necessary, but eases access).
• Remove the “E” clips from the shaft, and replace
the bushings one at a time.
• Reverse the removal process to install deck lift
shaft assembly bushings.
5.5. If it is necessary to remove the lift shaft assembly, the job can be done without removing the
fenders.
Embossed ridge faces inboard,
away from frame channel
Figure 5.3
NOTE: Lift link position and orientation.
6
5.6. Preliminary steps: See Figure 5.6.
The old blow-gun trick
Figure 5.6
700 SERIES LAWN TRACTORS
NOTE: The stepped “bow” in the middle goes
outboard, riding against the transaxle control
brackets.
5.9. Remove the bushings that support the lift shaft
assembly. See Figure 5.9.
• Remove the cutting deck.
• Disconnect and remove the battery.
• Remove the handle from the deck lift lever.
5.7. Remove the transaxle control linkage, complete
with the brackets that support it, as described in
the “TRANSAXLE CONTROL LINKAGE” section
of this manual. See Figure 5.7.
Unbolt transaxle
control linkage
here
Bushings
removed
Figure 5.9
NOTE: Use care not to damage the cooling fan
when removing the lift shaft assembly. The shaft
is in close proximity to the fan, and worn bushings may reduce the fan/lift shaft clearance to a
negative figure.
5.10. Remove the notched plate that surrounds the lift
lever using a T-40 Tor-X driver. See Figure 5.10.
Figure 5.7
5.8. If the deck lift rods have been re-connected to
the deck lift links to provide clearance for sliding
the cutting deck out from under the tractor, disconnect them.
NOTE: The deck lift rods are interchangeable
left-to-right, but it is important to maintain the
correct orientation.
7
Notched plate
Figure 5.10
700 SERIES LAWN TRACTORS
5.11. Slide the lift shaft to the right, so that the left end
clears the opening in the frame that the hexagonal bushing fits in.
5.12. Maneuver the left side lift rod out of the curved
slot in the lift-shaft arm, and up through the battery opening. See Figure 5.12.
Left side lift rod
Figure 5.12
5.13. Rotate the lift shaft arms up and back so that the
right side lift rod can be removed.
See Figure 5.13.
5.14. Once the lift rods are removed, the lift shaft can
be withdrawn, complete with the lift lever, out the
opening beneath the left fender.
See Figure 5.14.
Withdraw lift shaft
Figure 5.14
5.15. On the bench, the lift lever can be rotated in its
mounting hole in the lift shaft assembly to relieve
the torsion spring tension and align the coined
“ears” on the lever with the notches in the
bracket, so that it may be removed.
See Figure 5.15.
Figure 5.13
Right lift rod
Notches
Ears
Figure 5.15
8
700 SERIES LAWN TRACTORS
5.16. Installation notes: See Figure 5.16.
Figure 5.16
• Slide the lift shaft assembly into the frame
through the opening in front of the wheel.
• Position the lift lever through the opening in the
right fender.
• Install the lift rods onto the arms on the lift shaft,
from the inside-out.
• Confirm that the right side lift rod passes above
and in front of the lever and the end of the lift
shaft.
6. HYDROSTATIC TRANSAXLE
6.1. A Hydro-Gear model 348-0510 transaxle drives
the hydrostatic transmission equipped 790
series. See Figure 6.1.
Figure 6.1
6.2. If a warrantable problem occurs in the first two
years of service, the transaxle will be replaced
as a unit by an authorized White dealer, returning the transaxle to MTD for vendor recovery. It
may also be repaired by a Hydro-Gear authorized MTD dealer under the Hydro-Gear warranty.
• Insert each end of the lift shaft assembly through
the hexagonal openings in the frame.
• The remainder of the assembly is simply matter
of reversing the removal process.
• Check deck for side-to-side levelness and correct fore-aft adjustment of 1/4”-5/16” (6.35-8.00
mm) lower at the front, as measured at the blade
tips.
• Confirm correct operation of the blades and all
tractor safety features before returning the tractor to service.
6.3. If any non-warranty hydrostatic transaxle service is required, it can be performed by a White
or Hydro-Gear authorized MTD dealer. These
transmissions are feasible to repair, and the
repair / replace decision is left to the judgement
of the shop and the customer.
6.4. These transaxles frequently last the life of the
tractor with no need for service. To help increase
the life of the transaxle:
• Clean off accumulated mud or debris to aid cooling.
• Avoid using a pressure washer, as it may force
water past the seals, contaminating the fluid.
• Remove the rear wheels annually, clean the
axles, and apply a fresh coating of anti-seize
compound.
• Keep linkages and brakes properly adjusted.
• Replace the cooling fan promptly if it gets damaged.
• In normal service, do not attempt to drain and fill
the transaxle. There is no drain plug.
9
700 SERIES LAWN TRACTORS
6.5. Access to the fill plug can be gained by removing
the battery and the tray that supports the battery.
See Figure 6.5.
Figure 6.5
• Disconnect the negative (black) cable first, and
reconnect it last when the battery is reinstalled.
• After both cables are removed using a pair of 7/
16” wrenches, remove the battery hold-down.
• Carefully lift-out the battery.
6.7. After a thorough cleaning, to prevent contamination of the fluid, the fill plug can be removed
using a 1/4” allen wrench. See Figure 6.7.
20W-50
Figure 6.7
6.8. Between 5 deg. - 100 deg. f (10 deg. - 38 deg.
c), the fluid level should be 1” - 1.25” (2.54cm -
3.18cm) from the top of the housing.
Total capacity is .600 - .632 gal. (2271ml 2391ml) of 20W-50 motor oil having an API classification of SH/CD.
• Remove the battery tray.
6.6. Customers and unfamiliar technicians may
attempt to add or check the fluid level at the vent
cap on the plastic over-flow reservoir.
See Figure 6.6.
Expansion tank
Vent cap
Check/fill plug
Figure 6.6
6.9. The transaxle must be removed and inverted to
drain the fluid out.
6.10. After a fluid change, purge the system and topup the fluid to the correct level:
• With the engine at idle speed, and the by-pass
valve open, slowly cycle the control lever from
full forward to full reverse positions 5 or 6 times.
• Check fluid level, close the by-pass valve, and
repeat the previous step. When the transaxle
operates normally, without excessive noise, the
purge process is complete; all the air is out of
the system.
• Air in the system will cause a “growling” noise,
and sluggish performance.
6.11. In normal service, fluid replacement should not
be necessary, but in the event of fluid contamination or degradation, it can be done.
10
700 SERIES LAWN TRACTORS
6.12. The by-pass valve and brake are visible beneath
the right side frame channel. See Figure 6.12.
Brake
caliper
By-pass valve
•The by-pass valve is open when the by-pass
rod and lever are back. It is closed for normal
operation when the rod and lever are at the forward end of their travel.
Brake rotor
Figure 6.12
6.13. The brake rod pulls on a spring that is hooked to
the cam-arm on the brake caliper. The cam-arm
forces two pins inward against a backing plate
and brake pad. The pad forces the floating rotor
against a second pad located behind the rotor.
The pinching action creates the friction necessary to stop or hold the tractor.
6.14. A return spring pulls the cam arm back to relieve
the friction when the brake pedal is released.
See Figure 6.14.
Return spring
Extension spring
Cam arm
Brake rod
• An open by-pass valve will disable the transaxle.
• Open the by-pass to push the tractor.
•The brake is properly adjusted when a .015”
(.381 mm) feeler gauge will slip between the pad
and the rotor.
• Brake adjustment is made by removing the cotter pin from the castle-nut and rotating the nut to
tighten or loosen the clearance between the
pads and the rotor. There is no linkage adjustment.
• Replace the cotter pin with a new one after
making any brake adjustment.
•A tight or stuck brake can cause symptoms
similar to low fluid: noisy operation and sluggish
performance. In addition to these symptoms,
the brake will become extremely hot, and the
rotor will become discolored.
Figure 6.14
6.15. Slightly above and behind the brake assembly is
the friction pack. The friction pack maintains a
set amount of resistance in the control linkage:
See Figure 6.15.
Friction pack
Figure 6.15
• Too much resistance may raise control effort to
an unacceptable level. This would be caused by
an over-tightened nut on the friction pack.
11
700 SERIES LAWN TRACTORS
• Too little resistance may allow the linkage to drift
back to neutral, particularly when ascending a
grade conforming to the 15 degree description in
the Operators Manual. This condition may indicate that it is necessary to tighten the friction
pack nut slightly.
6.16. The factory setting on the friction pack is to
torque the nut to 100 in-lbs (11.3 n-m), then back
the nut off one full turn (360 deg.).
6.17. This setting should result in about 5 lbs (2.67
kg.) of resistance in the lever, measured as near
the end of the lever as possible.
See Figure 6.17.
7. TRANSAXLE CONTROL LINKAGE
7.1. The lever that controls the ground speed and
direction of travel is located on the right rear
fender.
7.2. The lever rotates a cross-shaft and bellcrank.
An adjustable rod connects the bellcrank to the
input arm on the left side of the transaxle.
See Figure 7.2.
Bellcrank Cross shaft
Adjustable rod
Input arm
Measuring control
force
Figure 6.17
NOTE: A belt tension checker such as that man-
ufactured by Browning is useful for checking
control resistance.
Figure 7.2
7.3. The input arm on the transaxle will return to neutral when the rod is disconnected. The rod
length should be adjusted so that the neutral
position of the control lever on the fender corresponds with neutral position of the input arm.
• If mis-adjusted, the tractor will “creep” in neutral,
or lurch as soon as the brake is released, even
though the control lever is in neutral.
• If one end of the rod is disconnected, with the
control lever in neutral, the centering action of
the input arm should not draw the end of the rod
a way from the hole it connects to.
• Lengthen or shorten the rod as necessary to
adjust, by threading it into or out of the ferrule.
• Reconnect the rod and test the operation of the
linkage and the tractor’s safety features before
returning the tractor to service.
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