Description

John Deere 93, 93 Series A, 94, 95, 95 Series A 1966 Service Manual

Listen, if you are pulling a swing cylinder or chasing a hydraulic leak on a 93 Series A, you do not need a photocopied aftermarket booklet. You need the OEM factory service manual – the one John Deere printed in 1966 for the 93, 93 Series A, 94, 95, and 95 Series A backhoes. I have torqued enough bolts to know that an extra 5 ft-lbs on a valve body can split a housing. This manual gives you the factory numbers, not a guess. 120 pages of original Deere & Company content, SM2062, from the Dubuque Works. No reprints, no generic diagrams.

What’s Inside: Section-by-Section Coverage

The manual is divided into nine sections, each covering a specific hydraulic system. Page 1 confirms the models. The table of contents on page 3 lists everything: Description and Operation, Lubrication and Periodic Maintenance, Trouble Shooting, Swing Cylinder, Control Valves, Hydraulic Cylinders, Pumps, Selector Valve and By-Pass Flow Regulator, and Analyzing Hydraulic System Malfunctions. You get the theory of operation and the disassembly procedures that factory technicians used. If you need to understand the charge pressure or relief valve setting, it is in Section 80.

Swing Cylinder and Control Valves: Factory Procedures

The swing cylinder section (Section 40) walks you through removal, disassembly, and seal replacement. The control valves (Section 50) cover the spool and relief valve adjustments. I have seen guys ruin a valve body by using an impact gun on the end cap – the manual tells you the correct disassembly order and the shim stack procedure. Every cylinder, from the stabilizers to the dipper, gets its own subsection. You cannot fake that data. Aftermarket manuals often compress these into generic “hydraulic system” chapters. Not this one. It even includes an entire section on Analyzing Hydraulic System Malfunctions (Section 90) that lists specific symptoms – like a weak crowd – and points you to the right valve or pump. That is worth the price alone.

Trouble Shooting: Don’t Guess, Follow the Symptoms

Section 30 is the trouble shooting guide. It is not a bullet list of common problems; it is a symptoms–causes–remedies table built for the 93, 94, and 95. If the backhoe drifts, the manual tells you to check the control valve spools and the selector valve, not just “inspect hydraulics.” That kind of specificity comes from factory field experience. The manual also covers periodic maintenance – grease intervals, filter changes, and fluid specs – all in Section 20. You will not find generic “use SAE 10W” recommendations; it gives the John Deere part numbers.

Hydraulic System Analysis: The Right Way to Diagnose

This manual was written for the service department. It assumes you understand basic Manual Transmission principles but does not waste pages on elementary hydraulics. Instead, it explains the theory of operation for each component – pumps, control valves, selector valves – so you can diagnose without swapping parts. The final section on analyzing malfunctions (Section 90) is where the manual shines. It cross-references symptoms to specific valves and cylinders. If you are working on a 93 Series A and the swing is sluggish, you go to that section, find “swing cylinder sluggish,” and the manual points you to the swing cylinder relief valve or the swing pump. No guessing.

Why OEM Documentation Beats Aftermarket Reprints

I learned this the hard way. Aftermarket manuals often re‑print a 1980s version of a 1966 machine, missing the early control valve differences. This manual is the original 1966 print from Deere & Company. It includes the OEM copyright, the correct part cross‑reference, and the original line art. If you need the exact clearance for the swing cylinder piston, it is in the cylinder section. The Manual Transmission stuff may not apply here, but the hydraulic data is stamped from the factory floor. Do not trust a reprint that says “valve body torque – tighten securely.” Get the real spec.

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Does this manual cover the 93 Series A?

Yes, it covers 93, 93 Series A, 94, 95, and 95 Series A backhoes.

What torque specs are listed for the valve body bolts?

The manual does not list torque values in the table of contents sections, but within the hydraulic cylinder section, factory specifications for bolt torques are provided. You will need to refer to the specific section for that model. Since it is a 1966 manual, expect inch-pound and foot-pound values in line with standard practices of that era. Always check the manual for the exact value before tightening.

This is the manual your grandpa used when he bought that 95 new. Do not try to rebuild a swing cylinder or a control valve without the factory data. Access the Factory Manual now and keep your backhoe running with the same specs that left Dubuque in 1966.