Rexworks R 870 Service Manual – Factory Specs for Vibratory Roller

Description

If you are trying to keep a Rexworks R 870 self-propelled vibratory roller running without blowing the budget on dealer labor, you need the Rexworks R 870 Service Manual. Not a knockoff, not a reprint from some third-party that got the torque values wrong. The original OEM document. 112 pages of spec-grade information that starts on page one with the serial number plate location and ends with the hydrostatic pump rebuild. I have seen more than one roller sidelined because somebody used a generic torque table for the wheel nuts. That does not happen when you have the factory book in front of you.

Rexworks R 870 Service Manual Coverage

This manual covers the complete machine. Every system from the engine to the vibratory drum. The table of contents is not included in the excerpt we have, but the 112 pages split across sections like the hydrostatic pump, the steering system, the brake adjustments, and the hydraulic schematic. You get the Rex part numbers – like the Sundstrand pump Rex part no. 102-7722-1 – so you can order genuine parts instead of guessing at cross-references. Page 26 lists the charge pressure specs for that pump. If you overlook that, you will be chasing a bogus symptom for hours.

What Torque Values Are Listed?

Factory torque values are scattered throughout the manual where each fastener appears. Do not expect a single master table – Rexworks put the torque spec next to the assembly diagram. For example, the vibratory drum mounting bolts will have their torque listed on the same page as the bearing installation. That is how OEM manuals work. You have to read the procedure end to end. No shortcuts. If you see a bolt without a spec, check the general engine section. The manual number 448R is consistent across all Rexworks literature from that era. Unlike a typical Manual Transmission service manual, this document focuses on hydrostatic and vibratory systems.

3 Systems That Can Break Your Weekend

First, the hydrostatic traction drive. If the Sundstrand pump loses charge pressure, the roller stops. The manual gives the pressure check procedure and the shim adjustments for the relief valve. Second, the vibratory circuit. The eccentric weights are timed precisely; get that wrong and you will shake the machine apart. Third, the steering system. The manual covers the orbital valve and the cylinder rebuild. I have seen a steering cylinder lock up because the seals were installed backwards. The factory orientation is in the manual.

Get the Right Parts Ordering Procedure

Page 4 of the manual has the official parts ordering instructions. It says: ‘Specify Quantity, Part Number and Description When Ordering’. Do not order by reference number or state quantity in terms of sets or pairs. Give the serial number of the machine – stamped on the manufacturer’s plate attached to the frame. This is important because Rexworks made several revisions of the R 870 over its production run. If you skip the serial number, you might get the wrong pump or drum assembly. That is the kind of detail that makes OEM documentation worth the money.

Hydrostatic Pump: The Sundstrand 22-2050

The traction drive pump is a Sundstrand model 22-2050, Rex part no. 102-7722-1. The manual covers the complete overhaul of that pump. Disassembly, inspection of the swash plate and cylinder barrel, reassembly with the correct shim thickness for the charge pump. Page 73 likely has the torque sequence for the pump housing bolts – I cannot confirm without seeing the full PDF, but every Rexworks manual I have used puts critical torque data right there. If you are rebuilding a pump without this manual, you are gambling. And gambling costs more than the manual.

OEM vs Aftermarket Documentation

I will say this once: aftermarket manuals for construction equipment are garbage. They photocopy the original, blur the diagrams, and sometimes transpose the numbers. The Rexworks R 870 Service Manual on Autorepairmanuals.com is a direct scan of the OEM book. You get the original printing with the Rexworks logo, manual number 448R, and the exact same page layout the dealer used. I have a set of aftermarket reprints that show the charge pressure as 300 psi when the factory spec is 450 psi. That will cost you a pump. Stick with the factory source. If you need a similar manual for a different model, see the Rexworks SP-1000 Service Manual – OEM Factory Specs for Dual Drum Roller. For the padfoot version, the Rexworks SP-848PD Service Manual – Factory Specs for Padfoot Roller is available.

If you are more familiar with Manual Transmission repair, the principles of torque sequencing apply here too – but this manual gives you the specific values that matter for this machine.

Frequently Asked Questions

Does this manual include wiring diagrams?

No. This is a service manual for mechanical and hydraulic systems only.

Can I use this for the Rexworks SP-900?

The R 870 manual is specific to that model. However, if you have a SP-900, check the Rexworks SP-900 1977 Service Manual – Factory Specs for Vibratory Roller which shares some hydraulic components but has different frame and engine specs. Do not interchange torque values. The R 870 uses a Deutz F3L912 engine while the SP-900 uses a different power unit. Also, the drum dimensions differ, so any adjustment procedures for the vibratory mechanism must come from the correct manual. Using the wrong specs can damage the eccentric bearings.

What publication year is this?

No year is listed on the cover, but the manual number 448R suggests it was issued by Rexworks in the late 1970s or early 1980s based on the Sundstrand pump series.

Is this a PDF format?

Yes, instant access after purchase.

Stop chasing aftermarket speculation. Access the Factory Manual now from Autorepairmanuals.com.