1988–1990 John Deere RX63, RX73, RX75, SX75, RX95, SX95 Riding Mowers Technical Manual (P/N TM1391)

John Deere technical manual TM1391, with the April 17, 1990 revision date, covers 1988–1990 RX63, RX73, RX75, SX75, RX95, and SX95 riding mowers, including 6 hp, 9 hp, and 12.5 hp engine variants. Its ten sections combine repair procedures with operational checkout and system diagnosis.

Text search and diagram detail: Procedure text is searchable, and 102 embedded bookmarks organize the sections and selected procedures. Image-based diagram lettering is not searchable. Small labels in the starting and ignition schematics remain partly indistinct when enlarged; the larger wiring diagrams are easier to read with zoom.

• Engine and fuel systems: Engine removal and installation, compression and crankcase-vacuum tests, governor and carburetor adjustments, and fuel-pump testing and repair.

• Power train: Mechanical transaxle removal and assembly, variator bearing service, drive-belt replacement, and standard and reduced-speed control adjustments.

• Electrical diagnosis: Starter and charging tests, ignition-coil testing, ignitor fault isolation, and safety-interlock checks for electric-start and recoil-start configurations.

• Steering and brakes: Tie-rod and sector-gear disassembly, steering gear alignment, front-axle and wheel-bearing repair, brake inspection, and linkage adjustment.

• Mower deck and PTO: Spindle overhaul, deck and lift-linkage removal and installation, PTO linkage adjustments, and mower-blade stopping checks.

• Factory reference data: Component-specific torque tables, wear limits, electrical test specifications, diagnostic charts, exploded views, and assembly drawings.

John Deere wrote this manual for experienced technicians; the diagnostic sections assume familiarity with the mower and its systems.

Engine and Fuel-System Repair

Separate engine removal and installation procedures address the 12.5 hp models and the 6 hp/9 hp models. Fuel-pump repair covers diaphragm and valve inspection, disassembly, and reassembly. Engine testing includes compression leakage and crankcase vacuum, with oil-pressure testing specifically for the 12.5 hp models.

Engine/Fuel System Operating Tests connect symptoms such as surging, hard starting, and low power to the relevant checks. Named diagnostic equipment includes the JDM-71 vibration tachometer, JDM-59 compression gauge, and JT05698 U-tube manometer.

Repair limits: Internal engine rebuilds and complete air cleaner, breather, and carburetor repair require the separate CTM-5, which is not included. The mixture-adjustment instructions identify the risk of damaging the carburetor needle and seat by forcing the adjustment screw.

Incomplete material: Illustration M49073 is missing from the engine removal and installation pages, and part of the crankcase-vacuum test text on PDF page 124 is incomplete.

Mechanical Transaxle and Variator Service

The power train uses a belt-driven variator and mechanical transaxle. The guide provides specialized data for the variator system, highlighting primary and secondary belt routing alongside variable speed control linkage adjustments.

The Variator Primary Belt Routing, Variator Secondary Belt Routing, and Transaxle Assembly drawings show the belt paths and internal drivetrain arrangement. Transaxle assembly coverage includes the forward/reverse gears, differential, axles, and early-unit shift detent.

The variator bearing is the only serviceable part of the variator assembly. Standard and reduced-speed adjustments are covered, along with the effect of primary-belt replacement on speed-control adjustment. Illustration M48147 is missing from the shift-control linkage checks.

Electrical Tests and Serial-Specific Wiring

Starting Circuits Wiring, Ignition Circuits Wiring, and the Charging System Wiring Diagram support starter, no-spark, and charging diagnosis. The tests distinguish electric-start and recoil-start interlocks, band-type and plunger-type seat switches, and SX indicator-lamp circuits.

Serial-specific key-switch connections and the change to regulator-equipped charging systems help match the electrical checks to the mower before tracing a starting or charging fault.

Wiring-page limitation: The page headed RX95/SX95, numbered 240-15-3, contains a diagram labeled RX75/SX75. It should not be treated as an unambiguous RX95/SX95 wiring reference.

Mower Spindles, Deck Linkage, and Service Specifications

Spindle exploded views and assembly procedures distinguish the 26- and 30-inch decks from the 38-inch deck. Bearing-installation cautions explain how pressure on the wrong bearing race can damage the spindle bearings.

Mower deck and lift-linkage removal and installation are included. Deck leveling is mentioned, but this file does not provide a dedicated leveling procedure.

The specification tables cover engine sheave and mounting fasteners, transaxle cover screws, spindle hardware, brake-pad wear limits, and brake-pedal travel.

Always prioritize workshop safety and consult a certified technician before performing major service procedures on this equipment, particularly around rotating blades and spring-loaded linkages.

Printable PDF and Page Breakdown

The ZIP archive contains one printable English PDF. Its 168 pages comprise 123 technical-content pages, 11 contents pages, two introduction pages, one cover, one Service Information Bulletin index page, and 30 blank or divider pages. All are included in the total; the referenced bulletin texts are not supplied.